{"action":"created","issue":{"url":"https://api.github.com/repos/facebook/react/issues/6887","repository_url":"https://api.github.com/repos/facebook/react","labels_url":"https://api.github.com/repos/facebook/react/issues/6887/labels{/name}","comments_url":"https://api.github.com/repos/facebook/react/issues/6887/comments","events_url":"https://api.github.com/repos/facebook/react/issues/6887/events","html_url":"https://github.com/facebook/react/issues/6887","id":156953484,"number":6887,"title":"ensureScrollValueMonitoring issue","user":{"login":"Andarist","id":9800850,"avatar_url":"https://avatars.githubusercontent.com/u/9800850?v=3","gravatar_id":"","url":"https://api.github.com/users/Andarist","html_url":"https://github.com/Andarist","followers_url":"https://api.github.com/users/Andarist/followers","following_url":"https://api.github.com/users/Andarist/following{/other_user}","gists_url":"https://api.github.com/users/Andarist/gists{/gist_id}","starred_url":"https://api.github.com/users/Andarist/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Andarist/subscriptions","organizations_url":"https://api.github.com/users/Andarist/orgs","repos_url":"https://api.github.com/users/Andarist/repos","events_url":"https://api.github.com/users/Andarist/events{/privacy}","received_events_url":"https://api.github.com/users/Andarist/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":7,"created_at":"2016-05-26T10:32:12Z","updated_at":"2016-05-26T19:21:46Z","closed_at":null,"body":"By having our app wrapped with Sentry (error catching service) we've encountered a bug - which may not be React specific but some kind of a workaround for it should be done. With that in mind I'm not sure how to tackle it yet.\r\n\r\nhttps://github.com/facebook/react/blob/1573baaee8ba1c9cd84145b01effcb5eb80503fb/src/renderers/dom/client/ReactBrowserEventEmitter.js#L363\r\n\r\n`TypeError: Cannot use 'in' operator to search for 'pageX' in null` - which occurs during mounting a root component into the DOM (using React 15)\r\n\r\nIt happens really rarely in Chrome (so far caught only there, on versions 49 and 50, both Mac and Windows). With thousands renders of our app daily we got only 7 such hits in the past 3 days.\r\n\r\nI've tried to search any info how `document.createEvent('MouseEvent')` can return `null`, but couldn't find any viable info.\r\n\r\nWith React's popularity is odd too me that nobody has filled this issue earlier which leds me to think that maybe our usage is somehow different than others and the only thing 'kinda' special is that our app is running inside an iframe."},"comment":{"url":"https://api.github.com/repos/facebook/react/issues/comments/221968514","html_url":"https://github.com/facebook/react/issues/6887#issuecomment-221968514","issue_url":"https://api.github.com/repos/facebook/react/issues/6887","id":221968514,"user":{"login":"syranide","id":1714255,"avatar_url":"https://avatars.githubusercontent.com/u/1714255?v=3","gravatar_id":"","url":"https://api.github.com/users/syranide","html_url":"https://github.com/syranide","followers_url":"https://api.github.com/users/syranide/followers","following_url":"https://api.github.com/users/syranide/following{/other_user}","gists_url":"https://api.github.com/users/syranide/gists{/gist_id}","starred_url":"https://api.github.com/users/syranide/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/syranide/subscriptions","organizations_url":"https://api.github.com/users/syranide/orgs","repos_url":"https://api.github.com/users/syranide/repos","events_url":"https://api.github.com/users/syranide/events{/privacy}","received_events_url":"https://api.github.com/users/syranide/received_events","type":"User","site_admin":false},"created_at":"2016-05-26T19:21:46Z","updated_at":"2016-05-26T19:21:46Z","body":"@f0rk Are you receiving it yourself or through bug reports? It would be interesting to know if `document.createEvent` is overloaded or not (i.e. the native function). Are you using any polyfills? According to the standard it should never return null and I don't see why it should."}}
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