diff --git a/src/upgrade.js b/src/upgrade.js
index 01c3da455c..0e0b2a0954 100644
--- a/src/upgrade.js
+++ b/src/upgrade.js
@@ -403,7 +403,7 @@ Upgrade.upgrade = function(callback) {
 							}
 							async.parallel([
 								async.apply(db.sortedSetAdd, 'groups:visible:createtime', groupData.createtime, groupName),
-								async.apply(db.sortedSetAdd, 'groups:visible:memberCount', groupData.memberCount, groupName),
+								async.apply(db.sortedSetAdd, 'groups:visible:memberCount', groupData.memberCount || 0, groupName),
 								async.apply(db.sortedSetAdd, 'groups:visible:name', 0, groupName.toLowerCase() + ':' + groupName)
 							], next);
 						});