[rules-users] using after in calendar rule

Following rule does not work for me (see exception) - I got the impression that having a calendar for a rule that uses "after" leads to this. Any ideas? (Version 5.5.0 Final) The point of time I get the exception is NOT within the defined calendar time (the rule should actually be ignored at that time...) rule "myrule" calendars "myCalendar" when //an event $event: Event() from entry-point "EventStream" //no more events after not (Event(this after[0 , 30m] $event)from entry-point "EventStream" ) then //actions end Exception in thread "main" org.drools.RuntimeDroolsException: Unexpected exception executing action org.drools.reteoo.PropagationQueuingNode$PropagateAction@56a75737 at org.drools.common.AbstractWorkingMemory.executeQueuedActions(AbstractWorkingMemory.java:995) at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:362) at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:311) at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:127) at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:55) at Application.runSimulation(Test.java:173) at Application.main(Test.java:68) Caused by: java.lang.NullPointerException at org.drools.time.impl.PseudoClockScheduler.removeJob(PseudoClockScheduler.java:147) at org.drools.common.Scheduler.removeAgendaItem(Scheduler.java:75) at org.drools.common.DefaultAgenda.removeScheduleItem(DefaultAgenda.java:475) at org.drools.common.DefaultAgenda.removeActivation(DefaultAgenda.java:352) at org.drools.common.DefaultAgenda.cancelActivation(DefaultAgenda.java:688) at org.drools.reteoo.RuleTerminalNode.retractLeftTuple(RuleTerminalNode.java:322) at org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateRetractLeftTuple(SingleLeftTupleSinkAdapter.java:224) at org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateRetractLeftTuple(SingleLeftTupleSinkAdapter.java:98) at org.drools.reteoo.NotNode.retractLeftTuple(NotNode.java:216) at org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateRetractLeftTuple(CompositeLeftTupleSinkAdapter.java:250) at org.drools.reteoo.CompositeLeftTupleSinkAdapter.propagateRetractLeftTuple(CompositeLeftTupleSinkAdapter.java:131) at org.drools.reteoo.NotNode.propagateRetractLeftTuple(NotNode.java:444) at org.drools.reteoo.NotNode.assertObject(NotNode.java:140) at org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59) at org.drools.reteoo.PropagationQueuingNode$AssertAction.execute(PropagationQueuingNode.java:426) at org.drools.reteoo.PropagationQueuingNode.propagateActions(PropagationQueuingNode.java:280) at org.drools.reteoo.PropagationQueuingNode$PropagateAction.execute(PropagationQueuingNode.java:588) at org.drools.common.AbstractWorkingMemory.executeQueuedActions(AbstractWorkingMemory.java:993) ... 6 more - Alex