Could be this issue. https://github.com/opencart/opencart/issues/1991
There are a few solutions. Backup your files and database before testing. Create a test product when trying out, that way it wont matter if it's deleted.
Bank transfer payments Confirm Order return:
Failed to load resource: the server responded with a status of 500 (Internal Server Error)
Failed to load resource: the server responded with a status of 500 (Internal Server Error)
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Failed to load resource: the server responded with a status of 500 (Internal Server Error) - fail.png (5.93 KiB) Viewed 1848 times
Works OK for me. Could it be caused by an extension or theme?
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