Looks like a bug in Group Finder related ESO UI code. An error occurred, and the code logging the error didn't format an integer properly into a string. (Apologies if I'm stating the obvious, but that's about all I can conclude from the stack trace)
Edited by Beilin_Balreis_Colcan on 7 December 2022 23:43
PC(Steam) / EU / play from Melbourne, Australia / avg ping 390