Game Crashes

First off, I LOVE the game!! Well done!! The issue is the game constantly crashes, every 3-5 minutes. I have attached a photo of the error message. Any help would be greatly appreciated.

Edit: I also can not place the Emissions and Performance Inspection points. I gives “Next Slot Not Found” when I try to place them.
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Hi, is this a custom map with a phenomenal amount of importers? The game cannot cope (at the moment) beyond a certain point, and this is a result. I am looking into expanding the size.