diff --git a/__tests__/__snapshots__/index.js.snap b/__tests__/__snapshots__/index.js.snap
index f1c7c70a..14a33782 100644
--- a/__tests__/__snapshots__/index.js.snap
+++ b/__tests__/__snapshots__/index.js.snap
@@ -303,6 +303,7 @@ Object {
         "SUBMISSION_END_DATE": "submissionEndDate",
       },
       "default": undefined,
+      "fixColorStyle": [Function],
       "getService": [Function],
       "normalizeChallenge": [Function],
     },
diff --git a/src/services/challenges.js b/src/services/challenges.js
index 32861093..5c453f66 100644
--- a/src/services/challenges.js
+++ b/src/services/challenges.js
@@ -363,7 +363,7 @@ class ChallengesService {
 
       /* Prepare data to logged user */
       if (memberId) {
-        isRegistered = _.some(registrants, r => r.memberId === memberId);
+        isRegistered = _.some(registrants, r => `${r.memberId}` === `${memberId}`);
 
         const subParams = {
           challengeId,
@@ -381,7 +381,7 @@ class ChallengesService {
 
           // Add submission date to registrants
           registrants.forEach((r, i) => {
-            const submission = submissions.find(s => s.memberId === Number(r.memberId));
+            const submission = submissions.find(s => `${s.memberId}` === `${r.memberId}`);
             if (submission) {
               registrants[i].submissionDate = submission.created;
             }