Some crash

[bjorn]

I picked every option consecutively until I had tried to go outside and was again facing that ghost and trying to kill it, when this happened:

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== 2017-04-25 10:24:41 ==
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Error: libs/timer.lua:163: attempt to perform arithmetic on a boolean value
stack traceback:
	libs/timer.lua:163: in function 'during'
	libs/timer.lua:45: in function 'update'
	src/scenes/play.lua:559: in function 'update'
	conf.lua:372: in function <conf.lua:252>
	[C]: in function 'xpcall'