I got this weird error message:

mod::in_chunk_generated(ID 12)
rso-mod/control-lua_944_ bad argument
(#)2 to 'rng' (interval is empty)

factorio version 0.15.12

this link has the save and mods used
https://www.dropbox.com/sh/sjstnyx1ms4tow4/AAAvlXCBQee6ZdO5gKIqKWQDa?dl=0

I was testing the resource spawn with your mod when i got a bit carried away and decided to find a ore patch with a value superior to 1G ore. max that i found was 879M ore.
The error happens if you continue to move to the left. if you move up and down the error does not appear.

Update: i was checking some recipes in this save file and the error apeared without me even moving

You found a new way to break the mod :)
I revised the code of enemy base spawning to prevent this and also allow them to be bigger.
It won't crash in this way anymore for many more tiles :D
Btw you can increase the distance factor a bit (1.2,1.3) to have significantly faster ore increase with distance.

I know that i can change the settigns. I was trying with default values. Even the ingame resource settigns were default.

Just tested the fix and seems to work

Thank you for the mod and your speedy bug fix