ACG-Player [V.2.6.3.6] App crashes when launched at intervals.

Description

I noticed that whenever I launch the app at intervals, it first crashes before working well. Assuming I used it to play songs now and exit. If after some time(20 to 30 minutes) I launch it, it first crashes and work fine when I re-launch it the second time.

Expected behaviour

I expected the app to work fine at first launching irrespective of the visiting interval. It shouldn't crash because I'm launching it after exiting for a while.

Steps to reproduce

• After downloading and installation

• Launch the app and use it for some time

• Stop using it and leave it for few hours.

• Launch it after few hour, and note the crash.

Video showing the behavior

Device used

• Techno spark k7

• Android 7.0 O.S

• App version 2.6.3.6

• App github link

Logcat

05-24 12:42:48.238 25091 25091 E AndroidRuntime: Process: top.geek_studio.chenlongcould.musicplayer.Common, PID: 25091
05-24 12:42:48.238 25091 25091 E AndroidRuntime: java.lang.RuntimeException: Unable to start receiver top.geek_studio.chenlongcould.musicplayer.broadcast.ReceiverOnMusicPlay: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.os.Handler.sendEmptyMessage(int)' on a null object reference
05-24 12:42:48.238 25091 25091 E AndroidRuntime: at android.app.ActivityThread.handleReceiver(ActivityThread.java:3107)
05-24 12:42:48.238 25091 25091 E AndroidRuntime: at android.app.ActivityThread.-wrap18(ActivityThread.java)
05-24 12:42:48.238 25091 25091 E AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1611)
05-24 12:42:48.238 25091 25091 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:110)
05-24 12:42:48.238 25091 25091 E AndroidRuntime: at android.os.Looper.loop(Looper.java:203)
05-24 12:42:48.238 25091 25091 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:6251)
05-24 12:42:48.238 25091 25091 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
05-24 12:42:48.238 25091 25091 E AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1063)
05-24 12:42:48.238 25091 25091 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:924)
05-24 12:42:48.238 25091 25091 E AndroidRuntime: Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.os.Handler.sendEmptyMessage(int)' on a null object reference
05-24 12:42:48.238 25091 25091 E AndroidRuntime: at top.geek_studio.chenlongcould.musicplayer.broadcast.ReceiverOnMusicPlay.onReceive(SourceFile:52)
05-24 12:42:48.238 25091 25091 E AndroidRuntime: at android.app.ActivityThread.handleReceiver(ActivityThread.java:3100)
05-24 12:42:48.238 25091 25091 E AndroidRuntime: ... 8 more```