See stack trace below. Unfortunately I just uncovered this in a log check so I dont have any further information surrounding the circumstances.
java.lang.NullPointerException at com.objectdb.o.SHN.ai(SHN.java:470) at com.objectdb.o.SHN.K(SHN.java:146) at com.objectdb.o.HND.run(HND.java:133) at java.lang.Thread.run(Thread.java:595)
Full log is attached.
NB: This occured in version 2-2-9_07 (as this is what we currently use in prod) so may be resolved in the latest version anyway.