There is a dodgy assumption in the function that triggered the error in your screenshot, which I can very easily fix. The player would have to be changing a vehicle equipment grid in a state where they had no character or no armour slot, e.g. God Mode. I see now, that makes sense. Yes, I only teste...

Hey Deadlock, Highly enjoying your mod so far, but I ran into a general issue with a rarely-used moddable feature in Factorio. Placing any accepted equipment in any vehicle's equipment grid causes this Lua error (image attached). This includes vanilla and modded vehicles. To give specific examples, ...