Whenever I exit the game, my entire computer freezes and I am unable to do anything. I don't recall this happening when I was using Windows but as soon as I switched to Linux, it began crashing. The log doesn't seem to be useful and I have no idea how to fix it.

That was in fact the issue. Thanks! script.on_event(defines.events.on_tick, function(event)
for player_index,player in pairs(game.players) do
if player.connected then
local craftingMultiplier = 0
local canCraftAdv = false
local canCraftFluid = false
local canSmelt = false
local canCraftChem ...

I have a few mods installed and the only one that I could think of to affect this is http://www.factoriomods.com/mods/crafting-equipment

Yes, the command is exactly as stated above

I have updated to 0.12.22 and it still does not work.

The command does not work at all. When I run to look at the variable it is always 0. I am using factorio 0.12.20