NPE deleting an expired event in equality mode

java.lang.NullPointerException
	at org.drools.core.common.NamedEntryPoint.delete(NamedEntryPoint.java:506)
	at org.drools.core.common.NamedEntryPoint.delete(NamedEntryPoint.java:442)
	at org.drools.core.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1120)
	at org.drools.core.phreak.RuleExecutor.fire(RuleExecutor.java:121)
	at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:74)
	at org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1003)
	at org.drools.core.common.DefaultAgenda.fireLoop(DefaultAgenda.java:1346)
	at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1284)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1303)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1293)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1274)
	at org.drools.compiler.integrationtests.CepEspTest.testDeleteExpiredEventWithTimestampAndEqualityKey(CepEspTest.java:5682)