I cant seem to replicate this at my end with 2.01c on 2.35 beta.
Can you try ripping out the entire history folder from the mod directory and then running it starting after 529? If that works put each part of the history folder back in one by one until you get the error.
Also beware, in my experience, clicking around on bookmarks and clicking on the date change arrows can sometimes create some unexpected results on screen and also crashes when loading. Sometimes the crashes can be replicated somtimes they cant. Constantly reloading the game after a crashes seems to create more problems.
As an example, I was getting a consistant crash as Utica with a start date of 562 on 2.01d (not released yet) on 2.36 beta. I loaded up 2.01c on 2.35 beta and tried Utica at 562 and it worked. I then went back to Utica with a start date of 562 on 2.01d on 2.36 beta and it worked. Very strange.