Hi *,
we recently upgraded from Magnolia 5.3.11 to 5.4.3 and are experiencing 
problems now with certain page properties dialog definitions.
Given a dialog definition that inherits a form from 
/modules/standard-templating-kit/dialogs/generic/master/basePageProperties by 
using the extends property. The form/tabs/tabChannels node is deleted by using 
extends=override. Attempting to open the page properties dialog leads to an 
exception (see stacktrace appended). When taking out the extends override 
property everything is fine. On field level the exends=override also is 
working. Just using it on tabDefinition level causes problems. Any idea 
somebody? Thanks in advance..

Cheers
Ingo

[code]2015-11-26 13:57:29.080 [http-bio-8081-exec-5] ERROR 
i.m.p.a.editor.PagesEditorSubApp - An error occurred while executing action 
[editProperties]
info.magnolia.ui.api.action.ActionExecutionException: Action execution failed 
for action: editProperties
        at 
info.magnolia.ui.api.action.AbstractActionExecutor.execute(AbstractActionExecutor.java:64)
 ~[magnolia-ui-api-5.4.3.jar:na]
        at 
info.magnolia.pages.app.editor.PagesEditorSubApp.prepareAndExecutePagesEditorAction(PagesEditorSubApp.java:358)
 [magnolia-pages-app-5.4.2.jar:na]
        at 
info.magnolia.pages.app.editor.PagesEditorSubApp.onActionbarItemClicked(PagesEditorSubApp.java:341)
 [magnolia-pages-app-5.4.2.jar:na]
        at 
info.magnolia.ui.actionbar.ActionbarPresenter.onActionbarItemClicked(ActionbarPresenter.java:205)
 [magnolia-ui-actionbar-5.4.3.jar:na]
        at 
info.magnolia.ui.actionbar.ActionbarViewImpl$1.actionTrigger(ActionbarViewImpl.java:67)
 [magnolia-ui-actionbar-5.4.3.jar:na]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
~[na:1.8.0_25]
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
~[na:1.8.0_25]
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 ~[na:1.8.0_25]
        at java.lang.reflect.Method.invoke(Method.java:483) ~[na:1.8.0_25]
        at 
com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:508) 
[vaadin-server-7.4.7.jar:7.4.7]
        at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:198) 
[vaadin-server-7.4.7.jar:7.4.7]
        at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:161) 
[vaadin-server-7.4.7.jar:7.4.7]
        at 
com.vaadin.server.AbstractClientConnector.fireEvent(AbstractClientConnector.java:977)
 [vaadin-server-7.4.7.jar:7.4.7]
        at 
info.magnolia.ui.vaadin.actionbar.Actionbar.access$000(Actionbar.java:59) 
[magnolia-ui-vaadin-common-widgets-5.4.3.jar:5.4.3]
        at 
info.magnolia.ui.vaadin.actionbar.Actionbar$1.onActionTriggered(Actionbar.java:72)
 [magnolia-ui-vaadin-common-widgets-5.4.3.jar:5.4.3]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
~[na:1.8.0_25]
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
~[na:1.8.0_25]
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 ~[na:1.8.0_25]
        at java.lang.reflect.Method.invoke(Method.java:483) ~[na:1.8.0_25]
        at 
com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:168) 
[vaadin-server-7.4.7.jar:7.4.7]
        at 
com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:118) 
[vaadin-server-7.4.7.jar:7.4.7]
        at 
com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:291)
 [vaadin-server-7.4.7.jar:7.4.7]
        at 
com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:184)
 [vaadin-server-7.4.7.jar:7.4.7]
        at 
com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:92)
 [vaadin-server-7.4.7.jar:7.4.7]
        at 
com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41)
 [vaadin-server-7.4.7.jar:7.4.7]
        at 
com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1408) 
[vaadin-server-7.4.7.jar:7.4.7]
        at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:350) 
[vaadin-server-7.4.7.jar:7.4.7]
        at 
info.magnolia.ui.admincentral.AdmincentralVaadinServlet.service(AdmincentralVaadinServlet.java:131)
 [magnolia-ui-admincentral-5.4.3.jar:na]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) 
[servlet-api.jar:na]
        at 
info.magnolia.cms.filters.ServletDispatchingFilter.doFilter(ServletDispatchingFilter.java:148)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:65) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.VirtualUriFilter.doFilter(VirtualUriFilter.java:69) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.module.cache.executor.Bypass.processCacheRequest(Bypass.java:58) 
[magnolia-cache-core-5.4.3.jar:na]
        at 
info.magnolia.module.cache.executor.CompositeExecutor.processCacheRequest(CompositeExecutor.java:67)
 [magnolia-cache-core-5.4.3.jar:na]
        at 
info.magnolia.module.cache.filter.CacheFilter.doFilter(CacheFilter.java:174) 
[magnolia-cache-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:59)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.i18n.I18nContentSupportFilter.doFilter(I18nContentSupportFilter.java:74)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.RangeSupportFilter.doFilter(RangeSupportFilter.java:84)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.security.BaseSecurityFilter.doFilter(BaseSecurityFilter.java:57)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.security.SecurityCallbackFilter.doFilter(SecurityCallbackFilter.java:80)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:59)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.security.LogoutFilter.doFilter(LogoutFilter.java:94) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:59)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.multisite.filters.MultiSiteFilter.doFilter(MultiSiteFilter.java:105)
 [magnolia-module-multisite-1.2.2.jar:na]
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.module.site.filters.SiteMergeFilter.doFilter(SiteMergeFilter.java:119)
 [magnolia-site-1.0.3.jar:na]
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MultiChannelFilter.doFilter(MultiChannelFilter.java:83)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.module.cache.filter.GZipFilter.doFilter(GZipFilter.java:73) 
[magnolia-cache-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:59)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.security.auth.login.LoginFilter.doFilter(LoginFilter.java:127)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.enterprise.registration.RegistrationFilter.doFilter(RegistrationFilter.java:64)
 [magnolia-module-enterprise-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.UnicodeNormalizationFilter.doFilter(UnicodeNormalizationFilter.java:88)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81) 
[magnolia-core-5.4.3.jar:na]
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
 [spring-security-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
        at 
org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
 [spring-security-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 [spring-security-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
        at 
org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)
 [spring-security-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 [spring-security-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
        at 
org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
 [spring-security-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 [spring-security-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
        at 
org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:154)
 [spring-security-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 [spring-security-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
        at 
org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)
 [spring-security-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 [spring-security-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
        at 
org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110)
 [spring-security-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 [spring-security-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
        at 
org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:57)
 [spring-security-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
        at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
 [spring-web-4.1.1.RELEASE.jar:4.1.1.RELEASE]
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 [spring-security-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
        at 
org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
 [spring-security-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 [spring-security-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
        at 
org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:50)
 [spring-security-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
        at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
 [spring-web-4.1.1.RELEASE.jar:4.1.1.RELEASE]
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 [spring-security-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
        at 
org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)
 [spring-security-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
        at 
org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
 [spring-security-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
        at 
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
 [spring-web-4.1.1.RELEASE.jar:4.1.1.RELEASE]
        at 
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
 [spring-web-4.1.1.RELEASE.jar:4.1.1.RELEASE]
        at 
info.magnolia.cms.filters.FilterDecorator.doFilter(FilterDecorator.java:90) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79) 
[magnolia-core-5.4.3.jar:na]
        at 
de.neofonie.srtl.cms.products.app.filter.ProductCampaignFilter.doFilter(ProductCampaignFilter.java:54)
 [srtl-cms-module-products-app-0.0.1-SNAPSHOT.jar:na]
        at 
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:59)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.personalization.preview.filter.PreviewFilter.doFilter(PreviewFilter.java:92)
 [magnolia-personalization-preview-app-1.2.2.jar:na]
        at 
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:59)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:81) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.ContentTypeFilter.doFilter(ContentTypeFilter.java:148)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.ContextFilter.doFilter(ContextFilter.java:128) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:79) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:65) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.SafeDestroyMgnlFilterWrapper.doFilter(SafeDestroyMgnlFilterWrapper.java:107)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlFilterDispatcher.doDispatch(MgnlFilterDispatcher.java:67)
 [magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:108) 
[magnolia-core-5.4.3.jar:na]
        at 
info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:94) 
[magnolia-core-5.4.3.jar:na]
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
 [catalina.jar:7.0.55]
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
 [catalina.jar:7.0.55]
        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
 [catalina.jar:7.0.55]
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
 [catalina.jar:7.0.55]
        at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
 [catalina.jar:7.0.55]
        at 
org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:683) 
[catalina.jar:7.0.55]
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) 
[catalina.jar:7.0.55]
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) 
[catalina.jar:7.0.55]
        at 
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) 
[catalina.jar:7.0.55]
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
 [catalina.jar:7.0.55]
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) 
[catalina.jar:7.0.55]
        at 
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
 [tomcat-coyote.jar:7.0.55]
        at 
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
 [tomcat-coyote.jar:7.0.55]
        at 
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
 [tomcat-coyote.jar:7.0.55]
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
[na:1.8.0_25]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
[na:1.8.0_25]
        at 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
 [tomcat-coyote.jar:7.0.55]
        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_25]
Caused by: java.lang.NullPointerException: null value in entry: 
info.magnolia.ui.form.definition.ConfiguredTabDefinition@3747c9a3=null
        at 
com.google.common.collect.CollectPreconditions.checkEntryNotNull(CollectPreconditions.java:33)
 ~[guava-16.0.jar:na]
        at 
com.google.common.collect.RegularImmutableMap.<init>(RegularImmutableMap.java:88)
 ~[guava-16.0.jar:na]
        at com.google.common.collect.ImmutableMap.copyOf(ImmutableMap.java:294) 
~[guava-16.0.jar:na]
        at com.google.common.collect.Maps.toMap(Maps.java:1121) 
~[guava-16.0.jar:na]
        at com.google.common.collect.Maps.toMap(Maps.java:1097) 
~[guava-16.0.jar:na]
        at 
info.magnolia.ui.dialog.formdialog.FormPresenterImpl.presentView(FormPresenterImpl.java:117)
 ~[magnolia-ui-dialog-5.4.3.jar:na]
        at 
info.magnolia.ui.dialog.formdialog.FormDialogPresenterImpl.buildView(FormDialogPresenterImpl.java:167)
 ~[magnolia-ui-dialog-5.4.3.jar:na]
        at 
info.magnolia.ui.dialog.formdialog.FormDialogPresenterImpl.start(FormDialogPresenterImpl.java:152)
 ~[magnolia-ui-dialog-5.4.3.jar:na]
        at 
info.magnolia.ui.dialog.formdialog.FormDialogPresenterImpl.start(FormDialogPresenterImpl.java:129)
 ~[magnolia-ui-dialog-5.4.3.jar:na]
        at 
info.magnolia.pages.app.action.EditElementAction.execute(EditElementAction.java:88)
 ~[magnolia-pages-app-5.4.2.jar:na]
        at 
info.magnolia.ui.api.action.AbstractActionExecutor.execute(AbstractActionExecutor.java:62)
 ~[magnolia-ui-api-5.4.3.jar:na]
        ... 155 common frames omitted[/code]

-- 
Context is everything: 
http://forum.magnolia-cms.com/forum/thread.html?threadId=f8b123f2-db30-4bc8-acc4-66015a882848


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