update referrer

src/main/java/com/common/broadcast/InstallReferrerReceiver.java

@@ -22,16 +22,19 @@ import tech.starwin.utils.PreferencesManager;
  */
 
 public class InstallReferrerReceiver extends BroadcastReceiver {
+    public static String referrer = "";
 
     public void onReceive(Context context, Intent data) {
         //SDK-CHANNEL-START
 //SDK-CHANNEL-CODE	        new com.mixpanel.android.mpmetrics.InstallReferrerReceiver().onReceive(context, data);
 //SDK-CHANNEL-CODE	        new com.kochava.base.ReferralReceiver().onReceive(context, data);
 //SDK-CHANNEL-CODE	        //SDK-CHANNEL-END
-
-        PreferencesManager.get().saveInstallReferrer(getReferrerValue(data.getExtras()));
+        referrer = getReferrerValue(data.getExtras());
+        if (!TextUtils.isEmpty(referrer)) {
+            PreferencesManager.get().saveInstallReferrer(referrer);
             EventBus.getDefault().post(ActionEnum.REFERRER_UPDATED);
         }
+    }
 
     private String getReferrerValue(Bundle bundle) {
         String referrerValue = "";