[rules-users] NPE in ClassFieldExtractor.getValue()

Hello Guys, I'm having a NPE in the ClassFieldExtractor.getValue(InternalWorkingMemory, Object) line: 127 It happens while executing the RHS of a rule that modifies one fact and then updates one and retract another. rule "foo" when ... then // apply changes PolicyHelper.makeInPolicy($room, $pRoom.getCompliantRuleId(), $pRoom.getPrefLevel(), ProfileTypeEnum.COMPANY); update($room); retract($pRoom); end -- We're using good old 4.0.7, with ShadowFacts :( I tracked down the problem to FactHandleIndexHashTable$FieldIndexEntry.matches(ReteTuple, int) line: Where, this.first.getFactHandle() Returns an invalidated fact handle (a handle of a fact that has been retracted before, I imagine). The NPE happens because invalidated handles have their "object" attribute set to "null" and the matches method mentioned above does: public boolean matches(final ReteTuple tuple, > final int tupleHashCode) { > return this.hashCode == tupleHashCode && this.index.equal( * > this.first.getFactHandle().getObject()*, > tuple ); Is there something I could do to workaround this problem? Any clue is welcome. Thanks, Leo.