Error: Data could not be saved. Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <=, >, >= or when the subquery is used as an expression. - when merging two constituents

When merging two constituents, the following error is received:

Error: "Data could not be saved. Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <=, >, >= or when the subquery is used as an expression."
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
 

Steps to Duplicate

1. Go to the Constituents functional area.
2. Click Duplicates.
3. Click Merge two constituents.
4. Populate the necessary fields.
5. Click Merge.

Environment

 Blackbaud CRM
 4.0.178

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