Method that sets a boolean in self crashes when played?

Hi,

I've been working freelance on new opensource technology for war clans to use; however, I've also stumbled upon problems while trying to instill new habits in myself. I attempted playing around with methods for compact code and more dynamic tables, but every-time I hit play-test using the code below server-side, it crashes.

local terminal = {
	Safe = false;

	Stability = 1000, -- time before win
	Rollback = 2;

	ServerElapsed = 3600;
	------------
	StatusChange = function(self, planted)
		self.Safe = (not planted)

		while (self.Safe == (not planted) and wait()) do
			self.Stability = (self.Stability < 1000 and self.Stability + (self.Safe and self.Rollback or -1))
			print('Timer:', self.Stability)
			if (self.ServerElapsed <= 0 or self.Stability <= 1000) then
				self.Stability = 1000
				break
			end
			wait(1)
		end

		print('Bomb has been', (planted and 'planted' or 'defused'))
	end,
};

terminal:StatusChange(true)

I've narrowed it down to this line right here:

self.Secure = (not planted)

So does this mean I can't set previous values in a table through a method? I'm really confused and would appreciate help!