All fridges and fridge freezer have have a mechanism for draining condensation. It is normally a small hole in the back of the fridge, often underneath the bottom shelf (often the veg crisper shelf). This drains to a tray at the back of the fridge where the water evaporates faster than condensation should drain. It sounds like either your tray is full or your drain is blocked in which case you would need to clean it out with a toothpick.
Neal, January 2008
