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

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at org.kuali.rice.krms.util.PropositionTreeUtil.removeCompoundProp(
at org.kuali.rice.krms.controller.RuleEditorController.cancelEditProposition(
at org.kuali.rice.krms.controller.RuleEditorController$$FastClassByCGLIB$$7c01aa07.invoke()
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(

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