"exception : buffer undeflow" issue - can't access anymore to my witch character

During a boss fight, i opened a door to go back to town and when I tried to go back to the boss fight. I got the following message "exception : buffer underflow", I can only click on Ok under the message and that close path of exile 2.
This issue occurs each time I try to acces to my witch character, no issue when i connect to my ranger character.

Now it is ok, I had the issue 3 times and after waiting 10 minutes, the problem disappeared. Maybe solved by instance reset.