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)