销售订单变更单报错

销售订单变更单审批流终审节点报错，公司内部开发说是bug，请问这个该怎么处理

[{"operation":"AP_ApprovalAssignHandle.MBIClick.tbWFSubmit"}]
发生时间： 16:37:48
错误编号： d1fd6caff16c4bd796f582dc542d626e
错误信息： 未将对象引用设置到对象的实例。
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调用堆栈：
在 Kingdee.K3.SCM.App.Sal.ServicePlugIn.SaleOrderChange.Audit.SetNewDeliPlan(DynamicObject unitObj, Int64 entryid, DynamicObjectCollection deliveryObj, DynamicObjectCollection SODeliEntry, BusinessInfo SODeliEntryInfo)
在 Kingdee.K3.SCM.App.Sal.ServicePlugIn.SaleOrderChange.Audit.AddChangeList(DynamicObject changeObj, Boolean onlyCheck, Boolean fromBill)