- Edited
I've running into this issue and finally stumbled across this thread.
@KevinTheJedi I found the recommendations and followed the steps to find the plugin and instance IDs, and ran the UPDATE syntax to set the backend for the users. This fixed almost all of my users, except for 6 users. Even after running this, the backend for the remaining non-working users was set to NULL. Re-running the UPDATE still would not change the backend for those users. I had to modify the UPDATE and specifically call out their usernames to have it update the fields, but it is still not allowing them to login. I did the same for the extras as it was set to NULL as well, setting it to {"browser_lang":"en_US"} like what all of the other users have, which did not help.
FYI, the non-working users are getting the HTTP 500 error.
Any idea what else I can try?