Summary: Intercepts an exception when some kingdoms offer vassalage to your clan, I think its related to a destroyed kingdom or a different kingdom leader, or the fact I never accepted any offers as I'm doing mercenary only playthrough, I am using mods, but there's no involved module in the report which leads me to believe that its related to the base game, not mod related.
Uploaded crash report: https://report.butr.link/E8D75A
Uploaded crash report: https://report.butr.link/E8D75A