The invention relates to a device and a method for preventing faults of an oven for producing containers, in particular cans. The device comprises: a conveyor unit with transport pins, said conveyor unit being designed to convey the containers along a drying section; at least one measuring unit which is designed to: ascertain an inlet number of containers which have entered an observation section of the drying section and an outlet number of containers which have exited the observation section; and a control device which is designed to: determine the amount of container loss on the basis of a deviation between the inlet number and the outlet number.