Enable/disable lockscreen does not work.

Expected behavior

When I opened sicmu music player, I saw an option of enabling lockscreen while playing songs so I thought I will be able to lockscreen on app while playing songs.

Actual behavior

After enabling lockscreen, I clicked on another song and the song was changed.
I tried multiple times but the same thing happened.
The lockscreen feature did not work.

How to reproduce

• Open sicmu music player
• Click on bottom right corner
• Click on lockscreen
• After the lockscreen is enabled, you will still be able to change songs by clicking or by shaking the phone.

• Operating system: Android 6.0.1

Recording Of The Bug