iOS 13.5.1 mobile app end to end force closes

Hello everbody

I’m currently using an iPhone 11 with 128GB. I’ve installed the Nextcloud app on the latest iOS release to test end to end encryption. End to end encryption works fine on my Mac so far without any issues. Unfortunately it doesn’t work on my iPhone. When I select the function in the app and after I type in the 12 words an the force closes itself without any error being shown.