Error
Error Code:
91
MySQL Error 91: Character Encoding Reset Failure
Description
This error indicates that MySQL encountered an issue resetting its internal character processing state when dealing with a 'secondary ignorable character'. This typically occurs during operations involving character data, especially when character sets, collations, or specific Unicode properties are not consistently managed across the database system.
Error Message
Failed to reset before a secondary ignorable character %s.
Known Causes
3 known causesInconsistent Character Sets
The character sets and collations used at different levels (server, database, table, column, or connection) are not uniformly configured, leading to conflicts when processing certain multi-byte characters.
Malformed Character Data
Attempting to insert or process character data that is not valid for the defined character set or contains unexpected Unicode sequences that MySQL cannot correctly interpret as 'ignorable'.
Client-Server Charset Mismatch
The character set configured for the client application connecting to MySQL differs from the character set configured on the MySQL server or the target database, causing misinterpretation of character data during communication.
Solutions
Coming SoonDetailed step-by-step solutions for this error are being prepared. In the meantime, try these general troubleshooting tips:
General Troubleshooting Tips
- Check the error message carefully for specific details
- Review recent changes that might have caused the error
- Search for the exact error code in the official documentation
- Check log files for additional context
- Try restarting the application or service