Cannot add the same observer with different lifecycles

[Roland Matusinka]

Build version: 0.0.86/master
Current date: 2019-03-15 16:49:30
Device: Xiaomi Mi A2 Lite

Stack trace:
java.lang.RuntimeException: Unable to start activity ComponentInfo{hu.mrolcsi.android.lyricsplayer/hu.mrolcsi.android.lyricsplayer.player.PlayerActivity}: java.lang.IllegalArgumentException: Cannot add the same observer with different lifecycles
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2916)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3051)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1811)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6694)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: java.lang.IllegalArgumentException: Cannot add the same observer with different lifecycles
at androidx.lifecycle.LiveData.observe(LiveData.java:179)
at hu.mrolcsi.android.lyricsplayer.player.PlayerActivity.onCreate(PlayerActivity.kt:139)
at android.app.Activity.performCreate(Activity.java:7136)
at android.app.Activity.performCreate(Activity.java:7127)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1272)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2896)
... 11 more