Can you send us the file below after reproducing this issue again? Please keep in mind that the log files will be reset when the game is launched again. It is crucial that you should upload the files right after the issue has happened. Please also note that the ProgramData folder is a hidden folder by default.
C:\ProgramData\Mount and Blade II Bannerlord\logs\rgl_log_xxxxx.txt
You can send me the file via email to arda.gunduz at taleworlds dot com Please include the forum threads URL so that I can find it easily. Thanks!