Error: An item with the same key has already been added when processing a reminder

When the user processes a reminder they generate Error:  An item with the same key has already been added
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

 2.93.2034, patch 0
 2.91.1535, patch 59

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