> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/server/reference/error-codes/mariadb-error-codes-1700-to-1799/e1766.md).

# Error 1766: The system variable cannot be set when there is an ongoing transaction

| Error Code | SQLSTATE | Error                                        | Description                                                                |
| ---------- | -------- | -------------------------------------------- | -------------------------------------------------------------------------- |
| 1766       | HY000    | ER\_VARIABLE\_NOT\_SETTABLE\_IN\_TRANSACTION | The system variable %s cannot be set when there is an ongoing transaction. |

## Possible Causes and Solutions

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