Seaquel
SQL Server error code

SQL Server error 9842

SQL Server raises error 9842 at severity 16, which marks a problem with the query or data that you can correct.

Invalid Unicode escape character was provided. The <UESCAPE character> cannot be <plus sign> <single quote> <double quotes> <space> <hexit>.
Msg9842
Severity16
Group9000–9999

Source: Database Engine events and errors