found this

PSA: Using iron-router? Make sure to test your app in Win10/Microsoft Edge packages Hi Forum! Stumbled upon an edge case today, in... Microsoft Edge, which only manifests if you're using RouteController's in a specific way. The annoying part- The error is only thrown when you navigate to the affected route! This means you need to test your app by going to every route! Or, you can try understand the problem, and see if the issue applies to you- // This example works in Chrome/Firefox, but fails in Edge. var A = RouteController.extend({ // In Edge this function gets…