java.lang.NullPointerException: Attempt to invoke virtual method 'void com.quickblox.chat.QBGroupChat.leave()' on a null object reference

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Attempt to invoke virtual method 'void com.quickblox.chat.QBGroupChat.leave()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'void com.quickblox.chat.QBGroupChat.leave()' on a null object reference
at com.quickblox.chat.model.QBChatDialog.leave(SourceFile:768)
at com.om.sigmatech.dating.MatchNotificationActivity$5.onSuccess(MatchNotificationActivity.java:313)
at com.om.sigmatech.dating.MatchNotificationActivity$5.onSuccess(MatchNotificationActivity.java:306)
at com.quickblox.auth.session.Query.notifySuccess(SourceFile:447)
at com.quickblox.auth.session.Query$VersionEntityCallback.completedWithResponse(SourceFile:483)
at com.quickblox.auth.session.Query.completedWithResponse(SourceFile:307)
at com.quickblox.core.server.HttpRequestRunnable$1.handleMessage(SourceFile:43)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)

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