If you're experiencing crashes after Team Select, we suggest you to remove the perk selection save file located at "Documents\Mount and Blade II Bannerlord\Config\MPDefaultPerks_USER.xml". The USER part of this path changes based on your username so you can delete all of the MPDefaultPerks files located in your Configs directory. If the problem still continues, please let us know the name of the server and the Factions that are present in that server.