Prevent crashes incase nav.platform is undefined

Author: ewolfe

src/components/helpers/get-ua-data.js

@@ -30,6 +30,6 @@ export const getNavigatorInstance = () => {
 export const isIOS13Check = type => {
   const nav = getNavigatorInstance();
   return (
-    nav && (nav.platform.indexOf(type) !== -1 || (nav.platform === 'MacIntel' && nav.maxTouchPoints > 1 && !window.MSStream))
+    nav && nav.platform && (nav.platform.indexOf(type) !== -1 || (nav.platform === 'MacIntel' && nav.maxTouchPoints > 1 && !window.MSStream))
   );
 };