Production Forge app getting error: "Unexpected token u in JSON at position 0"

We are encountering an issue with our Forge app in the production environment. The following error is being logged:

{ “message”:“Unexpected token u in JSON at position 0”, “name”:“FUNCTION_ERR”, “stack”:“SyntaxError: Unexpected token u in JSON at position 0\n at JSON.parse ()\n at run (index.js:31205:28)”,

}