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Just migrated from 3.6. probably did something wrong. This exception occurs when I select a method from source code editor's drop down list.
Created attachment 17958 [details] Message log.
I restarted NB and everything works fine. The message log shows no exceptions.
Reassigning to javacore.
Seems to be a problem in NavigationView.
IMO it relates to issue #50176 where the drop down list was not refreshed properly. So I consider this as fixed too. Please reopen the issue if you meet the problem again.