Can't perform any action with the application after installation

Expected behavior

I expect that after installing the application and launching it, i should be able to check the signature spoofing of my android device.

Actual behavior

After launching the application, it keeps showing "disabled", no means to enable it nor perform any other action with it, the application just hangs there.

How to reproduce

1. Download Signature Spoofing Checker from F-droid.
2. Launch the application

• Device: Tecno Camon CX
• Operating system: Android 7
• Application Version: version 1.1

Recording Of The Bug