Seaquel
SQL Server error code

SQL Server error 8705

SQL Server raises error 8705 at severity 16, which marks a problem with the query or data that you can correct.

A DML statement encountered a missing entry in index ID %d of table ID %d, in the database '%.*ls' due to an interaction with another transaction. If you continue to see this error, consider using Repeatable Read or higher isolation level.
Msg8705
Severity16
Group8000–8999

Source: Database Engine events and errors