I have a singleton class for loading and displaying ads

object AdmobProvider {     var countLoadAds = 0     lateinit var mInterstitialAd: InterstitialAd     private val adRequest = AdRequest.Builder().build()     fun init(activity: Activity) {         MobileAds.initialize(activity)         initInterstitial(activity)     }     private fun initInterstitial(context: Activity) {         mInterstitialAd = InterstitialAd(context)         if (!SubscriptionProvider.hasSubscription()) {             mInterstitialAd.adUnitId = context.getString(R.string.interstitial_video)             mInterstitialAd.loadAd(adRequest)             mInterstitialAd.adListener = object : AdListener() {                 override fun onAdClosed() {                     super.onAdClosed()                     Log.i("AdmobProvider", "onAdClosed: ")                 }                 override fun onAdFailedToLoad(p0: Int) {                     super.onAdFailedToLoad(p0)                     countLoadAds++                     Log.i("AdmobProvider", "onAdFailedToLoad: $countLoadAds")                     if (countLoadAds <= 3) {                         initInterstitial(context)                     } else {                         callback?.Failed(true)                     }                 }                 override fun onAdOpened() {                     super.onAdOpened()                     Log.i("AdmobProvider", "onAdOpened: ")                 }                 override fun onAdLoaded() {                     super.onAdLoaded()                     Log.i("AdmobProvider", "onAdLoaded: ")                     if (mInterstitialAd.isLoaded) {                         callback?.Success(true)                     }                 }             }         }     }     fun showInterstitial() {         if (mInterstitialAd.isLoaded) {             mInterstitialAd.show()         }     } } 

I load ads via

ActivityA in onCreate()

AdmobProvider.init(this) override fun Success(state: Boolean) {         Handler().postDelayed({             val intent = Intent(this@ActivityA, ActivityB::class.java)             intent.putExtra("ActivityB", 1)             startActivity(intent)             finish()         }, 200)     } 

and show in ActivityB in onCreate()

if (intent.getIntExtra("ActivityB", 0) == 1) {     AdmobProvider.showInterstitial() } 

While I tested it on the phone and emulators everything was fine, but from users, a crash began to arrive in the ActivityB, mainly on Android 8+

java.lang.RuntimeException: Unable to start activity ComponentInfo{MainActivity}: d.m: lateinit property mInterstitialAd has not been initialized     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3455)     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3598)     at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)     at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)     at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2164)     at android.os.Handler.dispatchMessage(Handler.java:107)     at android.os.Looper.loop(Looper.java:241)     at android.app.ActivityThread.main(ActivityThread.java:7582)     at java.lang.reflect.Method.invoke(Native Method)     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:941) Caused by: d.m: lateinit property mInterstitialAd has not been initialized     at .b.i(Unknown Source)     at .MainActivity.onCreate(Unknown Source)     at android.app.Activity.performCreate(Activity.java:7822)     at android.app.Activity.performCreate(Activity.java:7811)     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1328)     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3430) 

I understand what the error is, but I can't figure out how to fix it correctly, because if I initialize an advertisement in the second activity, I will need to load it there, but it doesn't suit me. According to statistics, 88% of cases crash in background. Please tell me how to fix it correctly?