FRULE: NotesException: Note delete failed

Error while saving document
Could not save the document NEW_1d NotesException: Note delete failed

NotesException: Note delete failed
    lotus.domino.local.Document.Nsave(Native Method)
    lotus.domino.local.Document.save(Unknown Source)
    lotus.domino.local.Document.save(Unknown Source)
    com.ibm.xsp.model.domino.wrapped.DominoDocument.save(DominoDocument.java:1087)
    com.ibm.xsp.model.domino.DominoDocumentData.doSaveDocument(DominoDocumentData.java:567)
    com.ibm.xsp.model.AbstractDocumentDataSource.save(AbstractDocumentDataSource.java:76)

what the heck is this???
I only found a very old note in the 6/7 LN forum. The guy thought it was related to some “null value vector”..

any ideas?

Update:
It happens when you try to put a NULL value vector somewhere, see also this blog.  It’s a feature not a bug!