Error: Object reference not set to an instance of an object when auto-mapping the fields on an import

When clicking the auto-map button on a constituent update import file, the user gets Error:  Object reference not set to an instance of an object
Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch. 

Environment

 2.9.1001, patch 61
 2.91.1535, patch 33 ; 2.9.1001, patch 71

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