java.lang.NullPointerException

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    • java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.util.ArrayList.contains(java.lang.Object)' on a null object reference at org.kiwix.kiwixmobile.KiwixMobileActivity.refreshBookmarkSymbol(KiwixMobileActivity.java:1411) at org.kiwix.kiwixmobile.KiwixMobileActivity.onPrepareOptionsMenu(KiwixMobileActivity.java:1400) at android.app.Activity.onPreparePanel(Activity.java:2982) at android.support.v4.app.FragmentActivity.onPrepareOptionsPanel(FragmentActivity.java:547) at android.support.v4.app.FragmentActivity.onPreparePanel(FragmentActivity.java:536) at android.support.v7.view.WindowCallbackWrapper.onPreparePanel(WindowCallbackWrapper.java:93) at android.support.v7.app.AppCompatDelegateImplBase$AppCompatWindowCallbackBase.onPreparePanel(AppCompatDelegateImplBase.java:297) at android.support.v7.view.WindowCallbackWrapper.onPreparePanel(WindowCallbackWrapper.java:93) at android.support.v7.app.ToolbarActionBar$ToolbarCallbackWrapper.onPreparePanel(ToolbarActionBar.java:567) at android.support.v7.app.ToolbarActionBar.populateOptionsMenu(ToolbarActionBar.java:455) at android.support.v7.app.ToolbarActionBar$1.run(ToolbarActionBar.java:61) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:777) at android.view.Choreographer.doCallbacks(Choreographer.java:590) at android.view.Choreographer.doFrame(Choreographer.java:559) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:763) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:145) at android.app.ActivityThread.main(ActivityThread.java:6117) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
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