Hi,

With the following environments (tested on both) :

-          CentOS 7, Geoserver 2.14.1 with Java 1.8

-          Windows 10, Geoserver 2.14.1 with Java 1.8

Uploading a picture in the text editor on the Style page yields the following 
stack trace :

org.apache.wicket.WicketRuntimeException: Method onRequest of interface 
org.apache.wicket.behavior.IBehaviorListener targeted at 
org.apache.wicket.ajax.markup.html.form.AjaxSubmitLink$1@6c8b3b8e on component 
[AjaxSubmitLink [Component id = submit]] threw an exception
        at 
org.apache.wicket.RequestListenerInterface.internalInvoke(RequestListenerInterface.java:268)
        at 
org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:241)
        at 
org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.invokeListener(ListenerInterfaceRequestHandler.java:248)
        at 
org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.respond(ListenerInterfaceRequestHandler.java:234)
        at 
org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:895)
        at 
org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
        at 
org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:265)
        at 
org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:222)
        at 
org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:293)
        at 
org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:261)
        at 
org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:203)
        at 
org.apache.wicket.protocol.http.WicketServlet.doPost(WicketServlet.java:159)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
        at 
org.springframework.web.servlet.mvc.ServletWrappingController.handleRequestInternal(ServletWrappingController.java:157)
        at 
org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:174)
        at 
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:50)
        at 
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
        at 
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
        at 
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
        at 
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
        at 
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
        at 
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:808)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1669)
        at 
org.geoserver.filters.ThreadLocalsCleanupFilter.doFilter(ThreadLocalsCleanupFilter.java:26)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
        at 
org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:69)
        at 
org.geoserver.wms.animate.AnimatorFilter.doFilter(AnimatorFilter.java:73)
        at 
org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:66)
        at 
org.geoserver.filters.SpringDelegatingFilter.doFilter(SpringDelegatingFilter.java:41)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
        at 
org.geoserver.platform.AdvancedDispatchFilter.doFilter(AdvancedDispatchFilter.java:37)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:317)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
        at 
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127)
        at 
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:74)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
        at 
org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:74)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at 
org.geoserver.security.filter.GeoServerAnonymousAuthenticationFilter.doFilter(GeoServerAnonymousAuthenticationFilter.java:51)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
        at 
org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:200)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:74)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
        at 
org.geoserver.security.filter.GeoServerUserNamePasswordAuthenticationFilter.doFilter(GeoServerUserNamePasswordAuthenticationFilter.java:112)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
        at 
org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:158)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:74)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
        at 
org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
        at 
org.geoserver.security.filter.GeoServerSecurityContextPersistenceFilter$1.doFilter(GeoServerSecurityContextPersistenceFilter.java:52)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:74)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
        at 
org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214)
        at 
org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177)
        at 
org.geoserver.security.GeoServerSecurityFilterChainProxy.doFilter(GeoServerSecurityFilterChainProxy.java:141)
        at 
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:347)
        at 
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:263)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
        at org.geoserver.filters.LoggingFilter.doFilter(LoggingFilter.java:90)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
        at 
org.geoserver.filters.XFrameOptionsFilter.doFilter(XFrameOptionsFilter.java:79)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
        at org.geoserver.filters.GZIPFilter.doFilter(GZIPFilter.java:42)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
        at 
org.geoserver.filters.SessionDebugFilter.doFilter(SessionDebugFilter.java:46)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
        at 
org.geoserver.filters.FlushSafeFilter.doFilter(FlushSafeFilter.java:42)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
        at 
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
        at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
        at 
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
        at 
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
        at 
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
        at 
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
        at 
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
        at 
org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215)
        at 
org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110)
        at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
        at org.eclipse.jetty.server.Server.handle(Server.java:499)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310)
        at 
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
        at 
org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540)
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.reflect.InvocationTargetException
        at sun.reflect.GeneratedMethodAccessor405.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.apache.wicket.RequestListenerInterface.internalInvoke(RequestListenerInterface.java:258)
        ... 103 more
Caused by: java.lang.NullPointerException
        at 
org.geoserver.wms.web.data.AbstractStylePage$9.onSubmit(AbstractStylePage.java:577)
        at 
org.geoserver.web.wicket.GeoServerDialog.submit(GeoServerDialog.java:170)
        at 
org.geoserver.web.wicket.GeoServerDialog$4.onSubmit(GeoServerDialog.java:182)
        at 
org.apache.wicket.ajax.markup.html.form.AjaxSubmitLink$1.onSubmit(AjaxSubmitLink.java:111)
        at 
org.apache.wicket.ajax.form.AjaxFormSubmitBehavior$AjaxFormSubmitter.onSubmit(AjaxFormSubmitBehavior.java:215)
        at 
org.apache.wicket.markup.html.form.Form.delegateSubmit(Form.java:1309)
        at org.apache.wicket.markup.html.form.Form.process(Form.java:976)
        at 
org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:797)
        at 
org.apache.wicket.ajax.form.AjaxFormSubmitBehavior.onEvent(AjaxFormSubmitBehavior.java:171)
        at 
org.apache.wicket.ajax.AjaxEventBehavior.respond(AjaxEventBehavior.java:155)
        at 
org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.onRequest(AbstractDefaultAjaxBehavior.java:601)
        ... 107 more

I did see this ticket : 
https://gis.stackexchange.com/questions/268928/css-plugin-triggers-an-error-on-geoserver
However it does not seem to be the same issue, and has been resolved in 2.12.1.

Thank you !

Best regards,

Louis Johanet
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