[1.42][SMP] Weird error

Here is a weird error that we receive after running script for some time



Script:

stevec = 0
while true do
	while turtle.suck() == false do
		sleep(1)
	end

	stevec = stevec + 1
	turtle.dropUp()
	print(stevec)
end

It will basically suck items in front of it and put it into chest above. It also prints how many times it sucked items. It's running on regular turtle.

When error happens computer is non-responsive (pressing any key as suggested does not do anything). Even Ctrl+T will not work, only reboot helps.