When I press the button 2 times, it crashes, how to fix it?

Question

Java

Hello, I have a button that is responsible for stopping the playback of the radio. The problem is that when I click on it 2 times, it crashes out of the application, how can I paint an event or do I need to write some kind of method? Thanks in advance
Button

@Override
            public void onClick(View view) {
                if (mediaPlayer.isPlaying()) {
                    mediaPlayer.stop();
                    mediaPlayer = null;
                    playPause.setChecked(false);
                }
                else {
                    playPause.setChecked(true);
                }
            }

I press play, starts playing

, press stop, stops

pressing stop again, does not crash, but returns the pause button

Answer 1

mediaPlayer = null; doesn't bother?

Answer 2

Wrap in try/catch and when pressed a second time, display the message "The player has already been stopped"