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

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java.lang.NullPointerException:
at org.kuali.kfs.module.purap.document.validation.impl.PurchaseOrderQuoteListRule.processAddCollectionLineBusinessRules(PurchaseOrderQuoteListRule.java:102)
at org.kuali.rice.kns.rule.event.KualiAddLineEvent.invokeRuleMethod(KualiAddLineEvent.java:39)
at org.kuali.rice.krad.service.impl.KualiRuleServiceImpl.applyRules(KualiRuleServiceImpl.java:85)
at org.kuali.rice.kns.web.struts.action.KualiMaintenanceDocumentAction.addLine(KualiMaintenanceDocumentAction.java:861)

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