> 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-1100-to-1199/e1121.md).

# Error 1121: Table handler doesn't support NULL in given index

| Error Code | SQLSTATE | Error                       | Description                                                                                                        |
| ---------- | -------- | --------------------------- | ------------------------------------------------------------------------------------------------------------------ |
| 1121       | 42000    | ER\_NULL\_COLUMN\_IN\_INDEX | Table handler doesn't support NULL in given index. Please change column '%s' to be NOT NULL or use another handler |

## Possible Causes and Solutions

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