diff --git a/src/groups.js b/src/groups.js
index c6db87f3c3..72cb0e9b28 100644
--- a/src/groups.js
+++ b/src/groups.js
@@ -365,7 +365,7 @@ var async = require('async'),
 			}
 			groupNames = internals.removeEphemeralGroups(groupNames);
 			if (groupNames.length === 0) {
-				return callback(null, null);
+				return callback(null, false);
 			}
 
 			Groups.isMemberOfGroups(uid, groupNames, function(err, isMembers) {