Exception when persisting data in google data store

[Ganesh via StackOverflow]

Getting the following exception when persisting the data. Its happening only during high traffic and not in normal hours.

java.lang.NullPointerException at org.datanucleus.state.AbstractStateManager.providedObjectField(AbstractStateManager.java:1447) at com.acti.interaction.jdo.InteractionJDO.jdoProvideField(InteractionJDO.java) at com.acti.interaction.jdo.InteractionJDO.jdoProvideFields(InteractionJDO.java) at org.datanucleus.state.AbstractStateManager.provideFields(AbstractStateManager.java:1515) at org.datanucleus.ObjectManagerImpl.getL2CacheableObject(ObjectManagerImpl.java:4846) at org.datanucleus.ObjectManagerImpl.putObjectsIntoLevel2Cache(ObjectManagerImpl.java:4864) at org.datanucleus.ObjectManagerImpl.performLevel2CacheUpdateAtCommit(ObjectManagerImpl.java:4286) at org.datanucleus.ObjectManagerImpl.processNontransactionalAtomicChanges(ObjectManagerImpl.java:1236) at org.datanucleus.ObjectManagerImpl.persistObject(ObjectManagerImpl.java:1630) at org.datanucleus.api.jdo.JDOPersistenceManager.jdoMakePersistent(JDOPersistenceManager.java:731) at org.datanucleus.api.jdo.JDOPersistenceManager.makePersistent(JDOPersistenceManager.java:756) at com.acti.interaction.service.InteractionService.persistInteractionService(InteractionService.java:200) at com.acti.interaction.controller.InteractionAction.persistInteraction(InteractionAction.java:60) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

Please DO NOT REPLY directly to this email but go to StackOverflow:
http://stackoverflow.com/questions/39576175/exception-when-persisting-data-in-google-data-store

[Ganesh via StackOverflow]