diff --git a/services/user.js b/services/user.js
index 9c8f9f4a..b4adf9a2 100644
--- a/services/user.js
+++ b/services/user.js
@@ -7,6 +7,7 @@ const Problem = require('../models/problem');
 const Submission = require('../models/submission');
 const CStudent = require('../models/student_contest');
 const Contest = require('../models/contest');
+const Raven = require ('raven');
 
 const getUser = function (userId, isMe, isChatModule) {
     if (isMe) {
@@ -90,9 +91,15 @@ const addToContest = function (b_code,userId) {
     return Contest.findAll({
         where: {batch_code:b_code},
     }).then(result => {
-        return  result.forEach((contest)=>{
-            CStudent.create({created_by:userId,user_id:userId,contest_id:contest.id}, {returning: true});
+        let cstudents = []
+        result.forEach((contest)=>{
+            cstudents.push({created_by:userId,user_id:userId,contest_id:contest.id});
         });
+        return cstudents;
+    }).then(cstudents => {
+        return CStudent.bulkCreate(cstudents, {returning: true});
+    }).catch(err=>{
+        Raven.captureException(err);
     });
 };