Error shows wrong table name

I am getting an error when attempting to update  records in a SQL table with records from a second SQL table on the same server and the same DB.

ERROR:

" Cannot insert the value NULL into column 'AColumnName', table 'My_Table'; column does not allow nulls. INSERT failed"

The table name shown in the error is not the table I am trying to update. Can someone help me understand why I am seeing a totally different table name in the error?

This is on a SQL Server 2016. The code I am using works on a SQL Server 2008.
Mike_K123Asked:
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Scott PletcherSenior DBACommented:
There's likely a trigger(s) on the table you are inserting to that attempts to modify other table(s).
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Mike_K123Author Commented:
Thank you. I needed to disable the trigger to complete the update.
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