Seaquel
SQL Server error code

SQL Server error 8980

SQL Server raises error 8980 at severity 16, which marks a problem with the query or data that you can correct.

Table error: Object ID %d, index ID %d, partition ID %I64d, alloc unit ID %I64d (type %.*ls). Index node page %S_PGID, slot %d refers to child page %S_PGID and previous child %S_PGID, but they were not encountered.
Msg8980
Severity16
Group8000–8999

Source: Database Engine events and errors