A small mod that validates user input in the system editor. This means it will not crash if you give it invalid data. If it sees invalid input, it will replace with some default values. It just checks if these fields are positive integers: Seed Radius Height Range Biome Scale Water Height Temperature Metal Density Metal Clusters It would be easy and to add in some range checks, any suggestions? If you can still crash the system editor with user input, let me know and I'll try to fix it further.