diff --git a/web/app/assets/javascripts/findSession.js b/web/app/assets/javascripts/findSession.js
index 6f44cb4b2..9032f24e7 100644
--- a/web/app/assets/javascripts/findSession.js
+++ b/web/app/assets/javascripts/findSession.js
@@ -175,12 +175,15 @@
 
         function containsInvitation(session) {
             var i, invitation = null;
-            // user has invitations for this session
-            for (i=0; i < session.invitations.length; i++) {
-                invitation = session.invitations[i];
-                // session contains an invitation for this user
-                if (invitation.receiver_id == context.JK.currentUserId) {
-                    return true;
+
+            if (invitations in session) {
+                // user has invitations for this session
+                for (i=0; i < session.invitations.length; i++) {
+                    invitation = session.invitations[i];
+                    // session contains an invitation for this user
+                    if (invitation.receiver_id == context.JK.currentUserId) {
+                        return true;
+                    }
                 }
             }
 
@@ -190,11 +193,13 @@
         function containsFriend(session) {
             var i, participant = null;
 
-            for (i=0; i < session.participants.length; i++) {
-                participant = session.participants[i];
-                // this session participant is a friend
-                if (participant !== null && participant !== undefined && participant.user.is_friend) {
-                    return true;
+            if (participants in session) {
+                for (i=0; i < session.participants.length; i++) {
+                    participant = session.participants[i];
+                    // this session participant is a friend
+                    if (participant !== null && participant !== undefined && participant.user.is_friend) {
+                        return true;
+                    }
                 }
             }
             return false;