Error message appears when editing a Map in Visio

Symptom

While editing a Map in Visio, the following message appears in the User Actions window:

14/06/2019 11:08:54
Object reference not set to an instance of an object.
An error occurred in the VisEventProc event

=== Begin For Triaster Support ===
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how to avoid this issue reoccurring.
Object reference not set to an instance of an object.
An error occurred in the VisEventProc event

System.NullReferenceException: Object reference not set to an instance of an object.
at Triaster.ProcessNavigator.Common.Helper.FileSupport.GetEquivalentUNCPath(String strLocalPath)
at Triaster.ProcessNavigator.Common.ProcessObjects.mdlMain.GetPNFileName(String strFileName)
at Triaster.ProcessNavigator.Common.ProcessObjects.DocumentsBase.GetPNFileName(String strFileName)
at Triaster.ProcessNavigator.Common.ProcessObjects.DocumentsBase.SavedAs(String& strOldFileName, String& strNewFileName)
at Triaster.ProcessNavigator.MappingEdition.Wrapper.clsMapEventSink.docObj_DocumentSavedAs(Document doc)
at Triaster.ProcessNavigator.MappingEdition.Wrapper.clsDocEventSinkBase.VisEventProc(Int32& eventCode, Object& sourceObj, Int32& eventID, Int32& seqNum, Object& subjectObj, Object& moreInfo)
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Cause

It is likely that you have Auto-save enabled in Microsoft Visio which will prompt this error.

Solution

In order to resolve this error you will need to disable the Auto-recovery option in Microsoft Visio by:

  1. Select File > Options
  2. Select Save
  3. Deselect the option: Save AutoRecover info every: (number) minutes
  4. Select OK
Last Reviewed: 14/06/2019