problem when use ViewBinding when use WebView

Question

i use View Binding in android. crash log :

Unable to destroy activity {land.majazi.majaziland/land.majazi.majaziland.views.activity.MainActivity}: java.lang.NullPointerException: Attempt to read from field 'android.webkit.WebView land.majazi.majaziland.databinding.FrCryptoDetailBinding.webViewChart' on a null object reference
android.app.ActivityThread.performDestroyActivity(ActivityThread.java:5629)
android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:5674)
android.app.servertransaction.DestroyActivityItem.execute(DestroyActivityItem.java:44)
android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:176)
android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97)
android.app.ActivityThread$H.handleMessage(ActivityThread.java:2309)
android.os.Handler.dispatchMessage(Handler.java:106)
android.os.Looper.loop(Looper.java:246)
android.app.ActivityThread.main(ActivityThread.java:8587)
java.lang.reflect.Method.invoke(Native Method)
com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)

web View Chart is already exist in XML file , but my app crashing sometimes

UPDATE

this is my fragment code (use NavigationComponent in project) :

private FrCryptoDetailBinding binding;

public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

    if (binding == null) {
        binding = FrCryptoDetailBinding.inflate(inflater, container, false);
        if (getArguments() == null) {
            goBack();
            return null;
        }
        md_cryptoCurrency = getArguments().getParcelable(getOrder());
        binding.setCurrency(md_cryptoCurrency);
        setView(binding.getRoot());
    }
    return binding.getRoot();
}

@Override
public void onDestroy() {
    super.onDestroy();
    binding.webViewChart.setWebViewClient(null);
    binding = null;
}