fix

src/main/java/au/com/royalpay/payment/manage/appclient/core/impls/RetailAppServiceImp.java

@@ -1175,9 +1175,13 @@ public class RetailAppServiceImp implements RetailAppService {
         deviceSupport.findRegister(clientType);
         JSONObject res = royalPayCMSSupport.listArticles("app_ad", false, true, 1, 10);
         JSONArray acts = res.getJSONArray("data");
+        if (acts.size()>0){
             int selectNo = RandomUtils.nextInt(0,acts.size());
             return acts.getJSONObject(selectNo);
         }
+        return null;
+
+    }
 
     private static boolean mathchLetterorNum(String str) {
         String regex = "[A-Za-z0-9]{8}";