All devices works fine except iPhone6. And editor crashed after moving a file or rename a file

Development Platform & Builds
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UE 4.20 , widonws 10 , xCode 10.1

It works fine on windows, all android devices and iPhone6s.
But It’s crashes on iPhone6 after splash screen. (no crash reports)

I made a new map and new blueprints not using old blueprints.
Then It works fine every devices include iPhone6.

If I try move a file or rename file make editor crash when save changed files.
I think It is the problem. Redirector.
I turned on the filter ‘show redirector’. But nothing happens.

Is there anyway to fix up messed with redirector manually?

  • I tried 4.21.1. But nothing changed.