I found a way to accidently cause a crash. If you edit a sign and leave the text blank and the map icon blank then check the add map icon it will crash the game. Since this is kind of hard to understand (and explain) I added a picture. Make your sign look like mine and hit OK. A crash will happen. I included a screenshot of the crash log.

I don't think there is a way to include images on this forum. I had to use imgur.com. It is safe. You will just have to trust me on this.

Crash Log: https://imgur.com/a/ODENGoe
Options: https://imgur.com/7KW5Mrv

I don't code mods but my guess to what is happening is the game is trying to add some nothing to the map and it doesn't know what to do.

I really like the mod and you have done an amazing job. This bug is kind of obscure but I'm in the habit of reporting crashes while I can.

Fixed. Thanks for the report. Thats a high priority ! =)

You work fast. Thanks for fixing this. I can confirm the crash is gone.

I just noticed you are the author of Mining Space Industries. That is also a great mod. I played the original and now the sequel.