Merge "[Settings] Avoid from crash" am: fdb57510cd

Original change: https://android-review.googlesource.com/c/platform/packages/apps/Settings/+/1385026

Change-Id: Ib83865b6248d6b3dcc4426a0a9729c8a76c1c0c2

src/com/android/settings/network/telephony/ApnPreferenceController.java

@@ -93,6 +93,9 @@ public class ApnPreferenceController extends TelephonyBasePreferenceController i
     @Override
     public void updateState(Preference preference) {
         super.updateState(preference);
+        if (mPreference == null) {
+            return;
+        }
         ((RestrictedPreference) mPreference).setDisabledByAdmin(
                 MobileNetworkUtils.isDpcApnEnforced(mContext)
                         ? RestrictedLockUtilsInternal.getDeviceOwner(mContext)