修改

game-business/src/main/java/com/game/business/controller/AppUserAgentController.java

@@ -99,6 +99,8 @@ public class AppUserAgentController extends BaseController
         String subset =  dbPuserAgent.getSubset();
         if(StringUtils.isNotBlank(subset)){
             subset = subset.concat(",");
+        }else{
+            subset = "";
         }
         subset = subset.concat(String.valueOf(appUser.getUserid()));
         AppUserAgent updateUserAgent = new AppUserAgent();