If multiple sessions in a concurrent batch fail, you might want to truncate all targets and run the batch again. However, if a session in a concurrent batch fails and the rest of the sessions complete successfully, you can recover the session as a standalone session.
To recover a session in a concurrent batch:

Copy the failed session using Operations-Copy Session.
Drag the copied session outside the batch to be a standalone session.
Follow the steps to recover a standalone session.
Delete the standalone copy.   _{Your Comment}