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window.opera = null problem #11853

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alisherdavronov opened this issue Dec 14, 2017 · 1 comment
Closed

window.opera = null problem #11853

alisherdavronov opened this issue Dec 14, 2017 · 1 comment

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@alisherdavronov
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I want to report a bug.

When there is a var named opera with value null in window before loading react then react app crashes.

Steps to reproduce:

  1. Create a new app using create-react-app my-app
  2. cd my-app && yarn start
  3. Add one line (<script>window.opera=null</script>) just before closing body tag into file public/index.html
  4. The app crashes here.

Couldn't reproduce on jsfiddle.net. I think because problem appears if we execute window.opera=null BEFORE loading react.

Expected behavior is to not crash.

React v16.2.0 and Google Chrome Version 63.0.3239.84 (Official Build) (64-bit).
Have no info about problematic behavior with previous versions of React.
alisherdavronov added a commit to alisherdavronov/react that referenced this issue Dec 14, 2017
@alisherdavronov
Fixed an issue facebook#11853 - window.opera=null problem
5705af3
nhunzaker pushed a commit that referenced this issue Dec 19, 2017
@alisherdavronov @nhunzaker
Fixed an issue #11853 - window.opera=null problem (#11854)
faa4218
@aweary
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aweary commented Dec 19, 2017 •
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Closed by #11854

@aweary aweary closed this as completed Dec 19, 2017
yenshih pushed a commit to yenshih/react that referenced this issue Jan 6, 2018
@alisherdavronov @yenshih
Fixed an issue facebook#11853 - window.opera=null problem (facebook#1…
2730d2b 
…1854)
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@alisherdavronov @aweary