Error: The given key was not present in the dictionary when adding a white mail segment

When attempting to add a white mail segment, the error: The given key was not present in the dictionary is returned.
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

 2.91.1535, patch 36
 2.91.1535, patch 44

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