Seaquel
SQL Server error code

SQL Server error 6325

SQL Server raises error 6325 at severity 16, which marks a problem with the query or data that you can correct.

XQuery: Replacing the value of a node with an empty sequence is allowed only if '()' is used as the new value expression. The new value expression evaluated to an empty sequence but it is not '()'.
Msg6325
Severity16
Group6000–6999

Source: Database Engine events and errors