My kettle's thermostat only releases the power switch, but doesn't actually cut the power, so if something is blocking the switch from going to the "off"(up) po

My kettle's thermostat only releases the power switch, but doesn't actually cut the power, so if something is blocking the switch from going to the "off"(up) position - like a large plate or something similar - it boils off all the water and then starts burning itself. Happen once and I only noticed because the light was on and I couldn't hear the water boiling because it wasn't there anymore.