Error: Unable to process query request. Conversion failed when converting from a character string to uniqueidentifier - when running a user-defined smart query in web shell

When running a user-defined smart query with drop-down menus, if no value has been select from the drop down users may receive the error:

Unable to process query request. Conversion failed when converting from a character string to uniqueidentifier.

This issue only occurs in web shell and if the drop-down fieldsinvolved do not contain data. This issue also occurs with user-defined data lists.

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

 2.94.1524.56
 2.94.1524, patch 65

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