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"Invalid doc parameter. Document may not be null!"
Created attachment 11679 [details] netbeans 3.5.1 ide.log
As for NPE in MarkBlockChain.compareBlock, there is already an issue #33455 for that. "NullPointerException: Invalid doc parameter. Document may not be null!" seems to be a problem of openide/editor. Reassigning.
Do you have any steps to reproduce? Generally, it may be caused by the same underlaying problem like issue 37178
*** Issue 36434 has been marked as a duplicate of this issue. ***
This bug can't occur anymore after last fix for 40766
verified in [nb_dev](200406291800)