Factorissimo adds factory buildings to Factorio. Place them down, walk in, build your factories inside!
Mods introducing new content into the game.
I just happened to notice a missing check for event.element.valid in the GUI click handler, which could cause a crash if another mod's GUI handling destroys the button before Factorissimo gets a chance to handle it.
event.element.valid
I've submitted a pull request fixing this.
PR has been merged, will be added to the next release.
