IllegalStateException: GoogleApiClient is not connected yet.

java.lang.RuntimeException: Unable to resume activity {com.offer4app.demo/com.easy_money.earn_app.reward.recharge.video.activity.MainActivity}: java.lang.IllegalStateException: GoogleApiClient is not connected yet.
    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3873)
    at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3914)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1709)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:154)
    at android.app.ActivityThread.main(ActivityThread.java:6816)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1563)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1451)
Caused by: java.lang.IllegalStateException: GoogleApiClient is not connected yet.
    at com.google.android.gms.common.api.internal.zzaz.zze(Unknown Source)
    at com.google.android.gms.common.api.internal.zzbi.zze(Unknown Source)
    at com.google.android.gms.common.api.internal.zzba.zze(Unknown Source)
    at com.google.android.gms.internal.zzcfy.removeLocationUpdates(Unknown Source)
    at com.onesignal.LocationGMS.onFocusChange(LocationGMS.java:291)
    at com.onesignal.OneSignal.onAppFocus(OneSignal.java:1050)
    at com.onesignal.ActivityLifecycleHandler.handleFocus(ActivityLifecycleHandler.java:120)
    at com.onesignal.ActivityLifecycleHandler.onActivityResumed(ActivityLifecycleHandler.java:74)
    at com.onesignal.ActivityLifecycleListener.onActivityResumed(ActivityLifecycleListener.java:48)
    at android.app.Application.dispatchActivityResumed(Application.java:240)
    at android.app.Activity.onResume(Activity.java:1336)
    at android.support.v4.app.FragmentActivity.onResume(FragmentActivity.java:446)
    at com.easy_money.earn_app.reward.recharge.video.activity.MainActivity.onResume(MainActivity.java:184)
    at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1277)
    at android.app.Activity.performResume(Activity.java:7142)
    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3850)