If a user reports a 500 error, what information should you ask them to provide to help with debugging?

Ask the user for the exact steps they took to reproduce the error. Request the URL they were accessing when the error occurred. Ask them what browser they are using and its version. If possible, ask them to provide a screenshot of the error message. Also, ask if the error happens consistently or intermittently. This information can help narrow down the cause of the problem.