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Mustang, dev 051014. CloneableEditorSupport.getDocument() is apparently returning null (as it is permitted to do) and DocumentLine is not handling that case.
Created attachment 26039 [details] Stack trace
Any steps to reproduce? Obviously a race condition, as the code was running inside document's readLock (i.e. document existed). I guess you were closing the editor in the middle of parsing/annotation processing. Caused by fix of #35184
*** Issue 67779 has been marked as a duplicate of this issue. ***
*** This issue has been marked as a duplicate of 77572 ***