router swallows excpetions on pushState

(not supported in iframes, used by builder)

packages/client/src/render/screenRouter.js

@@ -42,7 +42,11 @@ export const screenRouter = (screens, onScreenSelected) => {
       onScreenSelected(screens[fallback], store, _url)
     }
 
-    !url.state && history.pushState(_url, null, _url)
+    try {
+      !url.state && history.pushState(_url, null, _url)
+    } catch (_) {
+      // ignoring an exception here as the builder runs an iframe, which does not like this
+    }
   }
 
   function click(e) {