Hello, KR
This error seems to suggest that a variable[in this case, TranslateElement] was probably declared but not been assigned a value. There are a number of things to look at here but I think the first thing is to understand your implementation. How are you setting up the Google translation on your websites? I suppose you are simply making calls to the Translation API[0][1]?
Please reply with more detailed information about your implementation, so that we can have better understanding of your setup and how we can help.
By the way, I found this issue reported as well on this Stackoverflow link[2], I am not sure if your implementation/setup is similar to what the Customer is doing. Please check the comments, hopefully it helps