java.util.ConcurrentModificationException: This exception has no message.

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java.util.ConcurrentModificationException:
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:922)
at org.neo4j.ogm.session.event.SaveEventDelegate.postSave(SaveEventDelegate.java:84)
at org.neo4j.ogm.session.delegates.SaveDelegate.save(SaveDelegate.java:88)
at org.neo4j.ogm.session.delegates.SaveDelegate.save(SaveDelegate.java:44)
at org.neo4j.ogm.session.Neo4jSession.save(Neo4jSession.java:425)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:133)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:121)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at com.sun.proxy.$Proxy46.save(Unknown Source)

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