java.lang.RuntimeException: Unable to pause activity {com.music.test/com.music.test.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.media.MediaPlayer.isPlaying()' on a null object reference

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Unable to pause activity {my.package.myapplication/my.package.myapplication.Person1Screen}: java.lang.RuntimeException: writeValueXml: unable to write value content://com.android.providers.media.documents/document/image%3A49684
java.lang.RuntimeException: Unable to pause activity {com.music.test/com.music.test.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.media.MediaPlayer.isPlaying()' on a null object reference
at com.music.test.MainActivity.onPause(MainActivity.java:181)
at android.app.Activity.performPause(Activity.java:6397)
at android.app.Instrumentation.callActivityOnPause(Instrumentation.java:1380)

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