"Notification bar player" stays after quitting main application

The "notification bar player" stays after quitting main application while no media file is playing.
The 2nd button has a pause shape but nothing is being played.

This issue appears October the 10th.

• nightly 20171007 : fine
• nightly 20171010 : fine
• 2.5.4 : KO
• nightly 20171011 : KO

Android 5.1.1 / CyanogenMod 12.1