DESCRIPTION

QKSMS crashes when pressing Back button from Settings Activity after Orientation change.
This bug happens both in version on Google Play and built from Github.
It only happens when rotating screen in Category (Appearance, General, Notifications, MMS, QK Reply, etc. ) of Settings.

STEPS

1. Start QKSMS
2. Go to Settings by clicking on the OptionMenu -> Settings
3. Click on one Category in the list
4. When you are in the Category (for example, General), rotate the screen
5. After screen rotation, it will return to main Settings screen automatically (which is also not good)
6. Click on Back button

EXPECTED

Return to the Conversations Activity which contains the conversation list.

OBSERVATIONS

Crashes.

Logcat from Android Studio

FATAL EXCEPTION: main
Process: com.moez.QKSMS, PID: 22003
java.lang.IllegalStateException: Fragment already added: SettingsFragment{1d41d5f0 #0 id=0x7f0e0085 SettingsFragment}
at android.app.FragmentManagerImpl.addFragment(FragmentManager.java:1153)
at android.app.BackStackRecord.popFromBackStack(BackStackRecord.java:1547)