Having the exact same issue, here is the error that gets printed in the crash report (Which I can only assume is the same one you guys get)
[12:57:01.8803978] Exception occurred inside invoke: ExecuteCompleteTranstactions
Target type: TaleWorlds.CampaignSystem.ViewModelCollection.SPInventoryVM
Argument count: 0
Inner message: Object reference not set to an instance of an object.
Edit: This occurs once i've defeated a group of bandits, looters etc.