java.lang.NullPointerException: Attempt to write to field 'boolean ajj.c' on a null object reference. The problem is that I don't see any familiar names or my classes in the error message nor in stack trace. The other difficulty is that I still cannot reproduce this crash on my devices, so I don't know what action may cause it. Here is the full stack trace: java.lang.NullPointerException
java.lang.NullPointerException: null value in entry: skull-owner=null
08.10 04:52:21 [Server] WARN Error while building configuration map.
08.10 04:47:55 [Server] INFO Saved the world
08.10 04:47:55 [Server] INFO Saving...
08.10 04:47:55 [Server] INFO Saving is already turned on.
08.10 04:47:54 [Multicraft] Auto-saving world...
08.10 04:31:08 [Multicraft] Skipped 60 lines due to rate limit (100/s)