Reporting question for Humidifier - Grover, for Guitar Cases

Product:
Humidifier - Grover, for Guitar Cases

Question:
Hi, my concern with the Humidifier is; if in case the unit is over saturated with water, and accidentally drips water inside your guitar, how then can i prevent that little moisture, from ruining and clouding varnish of my guitar. Hoping you can enlighten me with my plight.