conflict resolution logs continuously coming in zeo.log

I am getting following logs in zeo.log again and again :



2017-06-09T15:31:46 ERROR ZODB.ConflictResolution Unexpected error while 
trying to resolve conflict on <type 'BTrees.OOBTree.OOBucket'>
Traceback (most recent call last):
File 
"C:\batonSites\Python27\lib\site-packages\zodb-4.4.3-py2.7.egg\ZODB\ConflictResolution.py", 
line 285, in tryToResolveConflict
resolved = resolve(old, committed, newstate)
File 
"C:\batonSites\Python27\lib\site-packages\zodb-4.4.3-py2.7.egg\ZODB\ConflictResolution.py", 
line 178, in _*cmp*_
"can't reliably compare against different "
ValueError: can't reliably compare against different PersistentReferences


What could be the reason of getting this type of error at ZEO end ?

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