Error
Error Code:
1413
MySQL Error 1413: Duplicate Handler Declaration
Description
Error 1413, 'Duplicate handler declared in the same block', indicates that a MySQL stored program (procedure, function, or trigger) attempts to define two or more `DECLARE HANDLER` statements for the identical SQL condition (e.g., a specific SQLSTATE code, `SQLEXCEPTION`, or `NOT FOUND`) within the same `BEGIN...END` block. This prevents the program from being created or altered successfully, as handler declarations must be unique per condition within their scope.
Error Message
Duplicate handler declared in the same block
Known Causes
3 known causesIdentical Handler Declaration
Defining two or more `DECLARE HANDLER` statements for the exact same SQLSTATE code, condition name, or condition type (e.g., `SQLEXCEPTION`, `SQLWARNING`, `NOT FOUND`) within the same `BEGIN...END` block.
Accidental Code Duplication
Unintentionally duplicating `DECLARE HANDLER` lines during code development, copy-pasting, or refactoring of stored procedures, functions, or triggers.
Misunderstanding Conditional Scope
Attempting to redeclare a handler for a specific condition within a block where an identical handler has already been established, indicating a misunderstanding of handler declaration rules.
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