Game crashes on login loading screen for specific character

This is on Windows 10, not Mac. Intel CPU, NVIDIA GPU. Beta build 4.4.0.54339

Logging into character Sergan - Classic Beta PvE. I tried most of my other characters and they worked fine.

Program: C:\World of Warcraft\_classic_beta_\WowClassicB.exe
Exception: ACCESS_VIOLATION - The instruction at '0x00007ff6582bbcdb' referenced memory at '0x000000000000f0b0'.
The memory could not be 'read'.
ProcessID: 17364
ThreadID: 8796

Report ID 1C5C057A-AA2E-4FF4-A633-C8813851ABE2

Had you been able to successfully log into Sergan previously? If so, where were you last when you logged out?

Yes, and Orgrimmar.

its a addon causing the problem mine was ratingbuster

Thanks, that helps, I was able to isolate the issue and added minimal reproduction steps here: https://github.com/JamminL/cata-classic-bugs/issues/996