# sqlalchemy.exc.InvalidRequestError: This session is in 'closed' state. No further SQL can be emitted within this transaction.

- **ID:** `python/sqlalchemy-exc-invalid-request-query-on-closed-session`
- **Domain:** python
- **Category:** runtime_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

Attempting to execute a query on a session that has been explicitly closed or has ended its transaction.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 3.x | active | — | — |

## Workarounds

1. **Create new session** (95% success)
   ```
   Create a new session instance: new_session = Session(); new_session.query(User).all()
   ```
2. **Check session is_active** (85% success)
   ```
   Ensure the session is not closed prematurely by checking session.is_active before queries.
   ```

## Dead Ends

- **Trying to reopen session** —  (80% fail)
- **Using non-existent method** —  (90% fail)