Window Leak in ComposeActivity

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E/WindowManager( 3973): E/WindowManager( 3973): android.view.WindowLeaked: Activity io.github.hidroh.materialistic.ComposeActivity has leaked window android.widget.LinearLayout{a5626440 V.E..... ......I. 0,0-264,96} that was originally added here E/WindowManager( 3973): at android.view.ViewRootImpl.(ViewRootImpl.java:348) E/WindowManager( 3973): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:248) E/WindowManager( 3973): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69) E/WindowManager( 3973): at android.support.v7.widget.TooltipPopup.show(TooltipPopup.java:85) E/WindowManager( 3973): at android.support.v7.widget.TooltipCompatHandler.show(TooltipCompatHandler.java:168) E/WindowManager( 3973): at android.support.v7.widget.TooltipCompatHandler.onLongClick(TooltipCompatHandler.java:116) E/WindowManager( 3973): at android.view.View.performLongClick(View.java:4474) E/WindowManager( 3973): at android.view.View$CheckForLongPress.run(View.java:18401) E/WindowManager( 3973): at android.os.Handler.handleCallback(Handler.java:733) E/WindowManager( 3973): at android.os.Handler.dispatchMessage(Handler.java:95) E/WindowManager( 3973): at android.os.Looper.loop(Looper.java:136) E/WindowManager( 3973): at android.app.ActivityThread.main(ActivityThread.java:5017) E/WindowManager( 3973): at java.lang.reflect.Method.invokeNative(Native Method) E/WindowManager( 3973): at java.lang.reflect.Method.invoke(Method.java:515) E/WindowManager( 3973): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) E/WindowManager( 3973): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) E/WindowManager( 3973): at dalvik.system.NativeStart.main(Native Method)