Error: "APPCRASH: WINWORD.EXE Fault Module Name: mso.dll" when running a Macro in Word during Word Merge

When selecting a Macro to run in Microsoft Word during a word merge, the error will appear and Word will stop working.
A common cause of this error is due to the navigation window being open in Microsoft Word when attempting to run the Macro. After Word crashes, re-start the merge in Word, but close the navigation window (pictured below) before running the Macro.
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