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java.lang.NullPointerException: 	at org.springframework.data.neo4j.support.conversion.EntityResultConverter.extractMapResult(EntityResultConverter.java:85)	at org.springframework.data.neo4j.support.conversion.EntityResultConverter.convert(EntityResultConverter.java:97)	at org.springframework.data.neo4j.conversion.QueryResultBuilder$1.convert(QueryResultBuilder.java:102)	at org.springframework.data.neo4j.conversion.QueryResultBuilder$1.singleOrNull(QueryResultBuilder.java:95)	at org.springframework.data.neo4j.repository.query.GraphRepositoryQuery.dispatchQuery(GraphRepositoryQuery.java:96)	at org.springframework.data.neo4j.repository.query.GraphRepositoryQuery.execute(GraphRepositoryQuery.java:70)	at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:313)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)	at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:155)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)	at undefined.$Proxy35.findWithLatestBeginByActivityCodeAndTimeRange(Unknown Source)	at com.ierin.paragon2.domain.repository.ActivityRepositoryTest.canFindActivityByActivityCodeAndTimeRange_BadActivityCode(ActivityRepositoryTest.java:65)