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java.lang.NullPointerException at org.drools.core.phreak.RuleNetworkEvaluator.deleteChildLeftTuple(RuleNetworkEvaluator.java:725) at org.drools.core.phreak.RuleNetworkEvaluator.unlinkAndDeleteChildLeftTuple(RuleNetworkEvaluator.java:718) at org.drools.core.phreak.PhreakJoinNode.doLeftDeletes(PhreakJoinNode.java:416) at org.drools.core.phreak.PhreakJoinNode.doNode(PhreakJoinNode.java:50) at org.drools.core.phreak.RuleNetworkEvaluator.switchOnDoBetaNode(RuleNetworkEvaluator.java:519) at org.drools.core.phreak.RuleNetworkEvaluator.evalBetaNode(RuleNetworkEvaluator.java:505) at org.drools.core.phreak.RuleNetworkEvaluator.evalNode(RuleNetworkEvaluator.java:341) at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:301) at org.drools.core.phreak.RuleNetworkEvaluator.doRiaNode(RuleNetworkEvaluator.java:573) at org.drools.core.phreak.RuleNetworkEvaluator.evalBetaNode(RuleNetworkEvaluator.java:500) at org.drools.core.phreak.RuleNetworkEvaluator.evalNode(RuleNetworkEvaluator.java:341) at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:301) at org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:136) at org.drools.core.phreak.AddRemoveRule.forceFlushLeftTuple(AddRemoveRule.java:652) at org.drools.core.phreak.AddRemoveRule.flushLeftTupleIfNecessary(AddRemoveRule.java:626) at org.drools.core.reteoo.BetaNode.assertObject(BetaNode.java:299) at org.drools.core.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:63) at org.drools.core.reteoo.WindowNode.assertObject(WindowNode.java:184) at org.drools.core.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:494) at org.drools.core.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:384) at org.drools.core.reteoo.ObjectTypeNode.propagateAssert(ObjectTypeNode.java:300) at org.drools.core.phreak.PropagationEntry$Insert.execute(PropagationEntry.java:93) at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:78) at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:68) at org.drools.core.impl.StatefulKnowledgeSessionImpl.flushPropagations(StatefulKnowledgeSessionImpl.java:2011) at org.drools.core.phreak.RuleExecutor.fire(RuleExecutor.java:128) at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:74) at org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1007) at org.drools.core.common.DefaultAgenda.fireLoop(DefaultAgenda.java:1350) at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1288) at org.drools.core.impl.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1306) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1297) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1278)