My app throws exception when manually terminating it from background

Hello i have my iPhone 5s connected to my mac at the moment, because i am testing my almost done app on my real phone.

When i launch it from Xcode it automatically launches on my phone, but the problem is when i am in the app on my phone, and i hit the Home button, so it goes to the background and from there if i hit home button twice and kill my app, in Xcode an exception is thrown in the main() function. There is no error description in the console.

Is this normal or can i fix this?