May be it helps you - recently I have make some changes in my app and after submitting in stores I got similar error - undefined is not a function. It runs on a device after updating (one - two times) while updates are running In my case "undefined is not a function" was function placed outside a component which I render: [enter image description here][1] [1]: https://i.sstatic.net/H8c6G5Oy.png