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A critical vulnerability was discovered in React Server Components (Next.js). Our systems remain protected but we advise to update packages to newest version. Learn More.
This is related to an old post: https://world.episerver.com/forum/developer-forum/-Episerver-75-CMS/Thread-Container/2019/1/cannot-read-property-contentdata-of-null----publish/
The issue was that the Publish menu was not responding due to a console error "Cannot read property 'ContentData' of null'. This was caused by a bug in Episerver.Marketing.Testing, and apparently fixed in v 2.5.5.
Just a heads up: I experienced the same problem running Episerver.CMS 11.13 and Episerver.Marketing.Testing 2.5.10.
The solution: I had to remove all temporary files from the browser.