NPE removing a rule from KieBase -------------------------------- Key: DROOLS-5405 URL: https://issues.redhat.com/browse/DROOLS-5405 Project: Drools Issue Type: Bug Components: core engine Affects Versions: 7.37.0.Final Reporter: dianle zhang Assignee: Mario Fusco Priority: Major removing a rule from KieBase causes the following NPE: java.lang.NullPointerException: null at org.drools.core.phreak.AddRemoveRule.iterateLeftTuple(AddRemoveRule.java:1063) ~[drools-core-7.37.0.Final.jar:7.37.0.Final] at org.drools.core.phreak.AddRemoveRule.visitChild(AddRemoveRule.java:978) ~[drools-core-7.37.0.Final.jar:7.37.0.Final] at org.drools.core.phreak.AddRemoveRule.lambda$processLeftTuplesOnLian$1(AddRemoveRule.java:936) ~[drools-core-7.37.0.Final.jar:7.37.0.Final] at org.drools.core.common.DefaultFactHandle$SingleLinkedTuples.forEachLeftTuple(DefaultFactHandle.java:727) ~[drools-core-7.37.0.Final.jar:7.37.0.Final] at org.drools.core.common.DefaultFactHandle.forEachLeftTuple(DefaultFactHandle.java:923) ~[drools-core-7.37.0.Final.jar:7.37.0.Final] at org.drools.core.phreak.AddRemoveRule.processLeftTuplesOnLian(AddRemoveRule.java:931) ~[drools-core-7.37.0.Final.jar:7.37.0.Final] at org.drools.core.phreak.AddRemoveRule.processLeftTuples(AddRemoveRule.java:856) ~[drools-core-7.37.0.Final.jar:7.37.0.Final] at org.drools.core.phreak.AddRemoveRule.removeRule(AddRemoveRule.java:173) ~[drools-core-7.37.0.Final.jar:7.37.0.Final] at org.drools.core.reteoo.ReteooBuilder.removeTerminalNode(ReteooBuilder.java:191) ~[drools-core-7.37.0.Final.jar:7.37.0.Final] at org.drools.core.reteoo.ReteooBuilder.removeRules(ReteooBuilder.java:177) ~[drools-core-7.37.0.Final.jar:7.37.0.Final] at org.drools.core.impl.KnowledgeBaseImpl.lambda$removeRule$6(KnowledgeBaseImpl.java:1553) ~[drools-core-7.37.0.Final.jar:7.37.0.Final] at org.drools.core.impl.KnowledgeBaseImpl.enqueueModification(KnowledgeBaseImpl.java:745) ~[drools-core-7.37.0.Final.jar:7.37.0.Final] at org.drools.core.impl.KnowledgeBaseImpl.removeRule(KnowledgeBaseImpl.java:1537) ~[drools-core-7.37.0.Final.jar:7.37.0.Final]