# NEXTLY_MIGRATION_CONCURRENT_RUN

Another run recorded the same migration while this one was running it.

## Cause

Another run recorded the same migration while this one was running it.

Two runs of the same migration overlapped, and the other one recorded it first. A file is recorded applied once, so this run's record was refused.

## Fix

* Run `nextly migrate:status` to see what the other run recorded.
* Where the Next line says this run's statements may have stayed applied, check what the migration changes before going on.

See [Production migrations](https://nextlyhq.com/docs/guides/production-migrations.md).

## Example

```text
✗ Another run recorded 20261020_120000_add_posts.sql applied while this one was running it.
  Why:  This run's statements were rolled back, and the ledger keeps the other run's record.
  Next: Run `nextly migrate:status` to see what the other run recorded; nothing of this run is left to undo.
  Docs: https://nextlyhq.com/docs/cli/errors/nextly-migration-concurrent-run  (NEXTLY_MIGRATION_CONCURRENT_RUN)
```