I've seen that on a refrigerator we had in our sticks and bricks. On the back of the freezer there should be a channel that collects water and drains it into a pan under the refer by the compressor. There's a one way rubber valve at the end of the line that sticks shut. It's just a piece of rubber tubing similar to an air vent in a DEF container. The flat end sticks shut. You may be able to open it with steam from the inside of the freezer. If not, you need access to the back of the refer. Either replace the valve or increase the opening by cutting a small bit off the flat end of the valve. This was on a Maytag 3 door refer. Yours may be different.
Dennis, Linda, and Scout the Dog
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