java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.kuali.rice.kim.service.impl.GroupServiceBase.isGroupMemberOfGroupInternal(GroupServiceBase.java:150)
at org.kuali.rice.kim.service.impl.GroupServiceBase.isGroupMemberOfGroup(GroupServiceBase.java:63)
at org.kuali.rice.kim.rules.ui.GroupDocumentMemberRule.processAddGroupMember(GroupDocumentMemberRule.java:68)
at org.kuali.rice.kim.document.rule.IdentityManagementGroupDocumentRule.processAddGroupMember(IdentityManagementGroupDocumentRule.java:180)
at org.kuali.rice.kim.rule.event.ui.AddGroupMemberEvent.invokeRuleMethod(AddGroupMemberEvent.java:50)
at org.kuali.rice.kns.service.impl.KualiRuleServiceImpl.applyRules(KualiRuleServiceImpl.java:86)
at org.kuali.rice.kim.web.struts.action.IdentityManagementGroupDocumentAction.addMember(IdentityManagementGroupDocumentAction.java:208)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

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