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Created attachment 19409 [details]
On iOS, adding and removing the header/footer on a ListView will throw an NRE when you try to add it again.
### Steps to reproduce
1. Run the attached iOS project
2. Press the "Toggle Footer" button to add a Footer
3. Press the button again to remove the Footer
4. Press the button again
### Expected Results
A footer is added to the ListView
### Actual Results
The app crashes with an NRE
### Version info
Reproduced with Forms 220.127.116.11 and 2.3.4-pre1
Submitted PR for fix: https://github.com/xamarin/Xamarin.Forms/pull/702
Should be fixed in 2.3.5-pre1. Thank you!
Verified on Xamarin.form version 18.104.22.1686-pre6