Prodigal music player stop playing and closs each time you press the phones multitask button

Expected behavior

when operating the prodigal music player, and click on the phone multitask button, i expect the player to still be playing and select the player again, it should not close

Actual behavior

while playing music, i click on the phone multitask key to check other apps that are running on the background, the prodigal music player stopped playing and when selected, it close it self.

How to reproduce

launch the app, select a song and play, while playing, click the multitask button scroll through the background that are running on the background and then select the prodigal music player.

• Browser: prodigal music player
• Operating system: Android 5.1.1 lollipop. infinix hot 3 LTE

Recording Of The Bug