android.view.WindowManager$BadTokenException -


i have strange issue. got crash report crashlyitics. seems doesn't show line activity code. didn't know when error happened. please have idea when exception happened. possible scenario?

android.view.windowmanager$badtokenexception: unable add window -- token null not valid; activity running?        @ android.view.viewrootimpl.setview(viewrootimpl.java:692)        @ android.view.windowmanagerimpl.addview(windowmanagerimpl.java:345)        @ android.view.windowmanagerimpl.addview(windowmanagerimpl.java:224)        @ android.view.windowmanagerimpl$compatmodewrapper.addview(windowmanagerimpl.java:149)        @ android.view.window$localwindowmanager.addview(window.java:556)        @ android.widget.mediacontroller.show(mediacontroller.java:338)        @ android.webkit.html5videofullscreen.showcontrollerinfullscreen(html5videofullscreen.java:386)        @ android.webkit.html5videoviewproxy$videoplayer.end(html5videoviewproxy.java:311)        @ android.webkit.html5videoviewproxy.handlemessage(html5videoviewproxy.java:432)        @ android.os.handler.dispatchmessage(handler.java:99)        @ android.os.looper.loop(looper.java:137)        @ android.app.activitythread.main(activitythread.java:4895)        @ java.lang.reflect.method.invokenative(method.java)        @ java.lang.reflect.method.invoke(method.java:511)        @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:994)        @ com.android.internal.os.zygoteinit.main(zygoteinit.java:761)        @ dalvik.system.nativestart.main(nativestart.java)

it seems, below line of code causes app crash generating , showing dialog window never dismiss / cancel when activity (screen) destroyed. please check whatever dialogs opening screen closed or dismiss before activity getting destroy.

at android.widget.mediacontroller.show(mediacontroller.java:338)


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