Stackoverflow error on route to /login

my Vaadin 24.2.6 app shows today for a certain user only the following error trying to open the /login view. The app was updated several days ago and the error occurred today for the first time. Any hints ?
message.txt (8.92 KB)

Could it be some cookie issues causing endless loop?

I let the user restart their browser (without any success in the first place) and don’t know exactly the situation regarding the cookies sent to the backend.

It may be worth to try to clear all the app cookies on the browser

just now the 2nd user reported this problem … I try to rollback to Vaadin 24.2.4 which was the previous used version.