Error: 'Unable to load datalist. Conversion from string --" to type integer is not valid' error in the segmentation segments view"

When viewing a marketing effort, the following error appears on the segments tab:

'Unable to load datalist. Conversion from string "--" to type integer is not valid' error in the segmentation segments view
Download and install the latest version and patch, if applicable. 

Environment

 2.91.1535
 2.93.2034

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