elisemn opened a new issue, #1261:
URL: https://github.com/apache/cordova-ios/issues/1261

   # Bug Report
   
   ## Problem
   
   An iframe in our app triggers a navigation action via `window.open` or 
`window.top.location.href` to a url that is in our allow-intent allow list. The 
url is correctly opened in the system browser. However after it is opened 
window.webkit.messageHandlers is undefined which causes runtime errors within 
the cordova exec.js file when it attempts to use the cordova message handler to 
post a message.
   
   TypeError
   null is not an object (evaluating 'window.webkit.messageHandlers.cordova')
   
   ### What is expected to happen?
   
   The URL opened by the iframe should be opened in the system browser without 
triggering errors within the cordova app.
   
   ### What does actually happen?
   
   After the URL is opened window.webkit.messageHandlers undefined errors occur
   
   ## Information
   <!-- Include all relevant information that might help understand and 
reproduce the problem -->
   
   
   
   ### Command or Code
   
   
   
   
   ### Environment, Platform, Device
   This issues appears to happen on any iOS mobile device.
   
   
   
   ### Version information
   <!-- 
   What are relevant versions you are using?
   For example:
   Cordova: Cordova CLI, Cordova Platforms, Cordova Plugins 
   Other Frameworks: Ionic Framework and CLI version
   Operating System, Android Studio, Xcode etc.
   -->
   
   ```
   Cordova Packages:
   
       cli: 11.0.0
           common: 4.0.2
           create: 4.0.0
           lib: 11.0.0
               common: 4.0.2
               fetch: 3.0.1
               serve: 4.0.0
   
   Project Installed Platforms:
   
       ios: 6.2.0
   ```
   
   
   
   ## Checklist
   - [x] I searched for existing GitHub issues
   
   - https://github.com/apache/cordova-ios/issues/1214 looks potentially 
related but does not callout the error being triggered by iframe calls to 
`window.open` or `window.top.location.href`
   
   - [x] I updated all Cordova tooling to most recent version
   - [x] I included all the necessary information above
   


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