Cannot read property 'then' of null in Iphone 5S

@luizricardoso wrote:

When I run my app through iPhone 5S Safari it presents the error below.

My app is hosted on Firebase Hosting, Chrome Desktop browser is working perfectly.

TypeError: Cannot read property 'then' of null
    at /Production/hosting-origin-backend/lib/reqPrepper.js:27:40
    at Layer.handle [as handle_request] (/Production/hosting-origin-backend/node_modules/express/lib/router/layer.js:95:5)
    at trim_prefix (/Production/hosting-origin-backend/node_modules/express/lib/router/index.js:317:13)
    at /Production/hosting-origin-backend/node_modules/express/lib/router/index.js:284:7
    at Function.process_params (/Production/hosting-origin-backend/node_modules/express/lib/router/index.js:335:12)
    at next (/Production/hosting-origin-backend/node_modules/express/lib/router/index.js:275:10)
    at /Production/hosting-origin-backend/lib/challengeResponder.js:24:14
    at tryCatch (/Production/hosting-origin-backend/node_modules/rsvp/dist/rsvp.js:539:12)
    at invokeCallback (/Production/hosting-origin-backend/node_modules/rsvp/dist/rsvp.js:554:13)
    at publish (/Production/hosting-origin-backend/node_modules/rsvp/dist/rsvp.js:522:7)
    at flush (/Production/hosting-origin-backend/node_modules/rsvp/dist/rsvp.js:2414:5)
    at nextTickCallbackWith0Args (node.js:420:9)
    at process._tickCallback (node.js:349:13)

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