ios app crashing on keyboard deactivate and changing stage focus

[JonnyCodes]

App crashes when I press enter on the keyboard and in the deactivate event I set the stage focus to null on ios. If I put a timer on setting the stage.focus is doesn't crash.

Steps to recreate:

1. Make an input text field.
2. Add an eventListener to the KeybaordDeactivate event.
3. Set stage.focus to null in keyboardDeactivate function.
4. Compile for ios.
5. Click on the input text field and press enter to close the keyboard
6. App crashes