Music starts automatically when I wake up phone- Player Pro/oneplus one

[anitje]

Big problem.

I really like Player Pro, but sometimes when I try to unlock my phone (double tap on what I think is called "lock screen"?) the player starts automatically. It's nice to have the player appear on the lock screen so I can control it without opening the phone, but horrible for the music to start accidentally. It happened in a nice restaurant yesterday where all the diners were forced to listen to Frank Zappa against their will. I am afraid I might get arrested or assaulted if I don't fix this quickly.

I played around with "settings" in Player Pro but it still happens , seemingly unpredictably.

It's a new phone and I am learning. Please help.

Thanks.