Seaquel
SQL Server error code

SQL Server error 8951

SQL Server raises error 8951 at severity 16, which marks a problem with the query or data that you can correct.

Table error: table '%ls' (ID %d). Data row does not have a matching index row in the index '%ls' (ID %d). Possible missing or invalid keys for the index row matching:
Msg8951
Severity16
Group8000–8999

Source: Database Engine events and errors