Android Browser Back Button

Hello,

I'm using the default C3 Browser addon to override the "mobile back button" on android:

"On mobile back button pressed -> CallMyFunctionAndNotCloseTheApp"

This works fine, but only if I first minimized my app with the phone's "menue button". After that I can press the phone's "back button" and it calls my function like it should.

But if I open the app and press the phone's "back button" before minimizing with "menue button", the "back button" closes the app.

How can I prevent this?

Thanks for help!