App does not get exit when click on back button

Project Information

• Repository link:
  https://github.com/shlomif/PySolFC

Expected behavior

App is supposed to exit without any error when click on back button

Actual behavior

But app does not get exit when click on back button many times; app shows no response when click on back button

How to reproduce

Download the app from f-droid

Launch the app

Open the app and click back button to exit

And note the bug

• Browser/App version: 2.2.0
• Operating system: 7.0

Recording Of The Bug