And some of those would have a real problem if you tried to divide by zero. They would get into an infinite loop – repeatedly subtracting 0 from the total until the total is reduced to zero. If you tried this with one of the early electric adding machines (which were just the same old mechanical ones but driven by an electric motor instead of a hand crank), they would go on forever. You had to do some kind of mechanical intervention to get them to stop.
Quickly enough, the manufacturers devised machines that could catch that error and stop themselves (or not even start), or had some lever or button on the front panel by which the operator could manually stop a divide-by-zero error.