@Sneaks: at least it sounds like an exciting endgame
Respect for not going into Firetuner and deleting a national wonder, I probably would have done that. Just a remark: with the OCC box checked the 5 NW limit does not apply, which of course was no help in your situation.
I can see how this information is easily missed; I will improve the info for the next version. Maybe make a little website. I think I will have a "reduce wonder hogging" option that is off by default, so you will have to manually enable it and read the implications.
In the future I want to add a little script that grants a free policy if a city becomes "legendary" and make some (national) wonders mutually exclusive to make things more interesting.
@tithin: if you have not restarted your game, can you post/send me the contents of Database.log and Lua.log in your Logs folder? They might hold a clue. I can't look at a savegame as I don't own the Babylon DLC. Also which other mods did you have running? And did any of the AI players successfully ally a productive city state before?
As for continuing your game I can only suggest to load an earlier autosave and try to prevent allying them (might be hard if quest rewarded). If the crash also occurs with earlier saves you might try clearing your cache.
The lack of description is going to stay I'm afraid. In fact that module I didn't create and changing it is not high on my priority list. I will have a look at Iceco's thread of the original version to see if a similar problem has popped up there.
Thank you for your reports and