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JSON Parse error

I keep getting this message on after about 10 minutes of my app running:
JSON.parse: unexpected end of data at line 1 column 1 of the JSON data

But I have no idea what it wants me to do. There is zero JSON anywhere in my own code, and it does not tell me where to look or what the issue is. This is the entire output from the error, there is no other information.

What can I do about this?