diff --git a/server/boot/challenge.js b/server/boot/challenge.js
index aade450945..67c4dbbf8d 100644
--- a/server/boot/challenge.js
+++ b/server/boot/challenge.js
@@ -40,7 +40,7 @@ function isChallengeCompleted(user, challengeId) {
   if (!user) {
     return false;
   }
-  return user.challengeMap[challengeId];
+  return !!user.challengeMap[challengeId];
 }
 
 /*