Commands out of sync

I'm getting this error when talking to MySQL

Status: 500 Internal Server Error   Mysql::Error: Commands out of sync; you can't run this command now: UPDATE `sessions` SET `data

This is the :active_record_store that is calling this command for the session store.

I'm running a command to retrieve some records from the DB. This error is for the active_record_store which rails uses to manage sessions. I'm not executing this command from my code. Also, this is not happenning on the dev server.