Keep Coding

I am facing a strange issue.
When I launch a fragment with setCustomAnimation() using the following code :
/**
* launch a fragment
*
* #param containerID - frameLayout ID
* #param fragment - fragment we want to launch
* #param isAddToBackStack - add to back stack???
*/
public void launchFragment(int containerID, Fragment fragment, boolean isAddToBackStack) {
FragmentManager mFragmentManager = getSupportFragmentManager();
FragmentTransaction mFragmentTransaction = mFragmentManager.beginTransaction();
mFragmentTransaction.setCustomAnimations(R.anim.anim_transition_enter_fade_in
, R.anim.anim_transition_exit_fade_out
, R.anim.anim_transaction_fade_in_pop
, R.anim.anim_transaction_fadeout_pop)
.replace(containerID, fragment);
if (isAddToBackStack) {
mFragmentTransaction.addToBackStack(null);
}
mFragmentTransaction.commitAllowingStateLoss();
}
When I quickly press the back button before the animation completes the app freezes.
I have recorded the App screen. Please check the video below :
https://drive.google.com/file/d/0BxFmkFbsB3NhNkRLbm8yQ195TUU/view?usp=drivesdk
Any help would be appreciated.
Thanks

I think your app is experiencing state loss before the animation ends.
Replace your:
mFragmentTransaction.commitAllowingStateLoss();
with:
mFragmentTransaction.commit();
If by changing the code above causes you IllegalStateException: Can not perform this action after onSaveInstanceState error,
then you might want to check this Blog about what's happening.
Hope this helps.