Every time this user tries linking their account, it sends the following to console:
[21:05:55 ERROR]: [DiscordSRV] [JDA] One of the EventListeners had an uncaught exception [21:05:55 ERROR]: [DiscordSRV] [JDA] java.lang.NullPointerException
The bot doesn't message her back, and it doesn't change her nickname, and it doesn't add the specified role either. If she tries to verify again, it says the account is already linked. When I use /discord linked it says it's linked too. When I try to unlink, it throws the following:
https://pastebin.com/kh2v9eGg

First error is not a full stack trace & thus I can't do anything to help

Second error is because the user is not a member of your Discord server when they're trying to link

That's legit the only thing console output for the first error, nothing before and nothing after. And that's weird because they are in the server in regards to second error. Anywho, I restarted the server and it all worked fine. I'll make sure to update in case it happens again!

Closing until able to reproduce