Not quite sure what that might be and as I only modify beastmen factions in an extremely minimal way, I doubt that it is my mod that is causing such crashes as I have never heard of that before from anyone else.

Also, it does not necessarily have to do with the actual faction that is displayed when it crashes, quite often it is an issue that happens at the start of the next faction instead. However I modify the new beastmen factions that came with Warhammer 2 and come right after Morghur's even less, nor do I modify Erengrad to any significant degree (the next non-beastmen faction in line, assuming all are alive), so potentially it has to do with whatever faction comes next in line for you, if these have already died and it's a different one instead.

In either case, I very much doubt that it happens because of this mod and the only way you can really find out which one it might be is to turn off other mods that you think may cause it and see if that helps. If it does, please report the issue to the mod that seems to cause it.