fix tests

test/api/groups.coffee

@@ -270,7 +270,8 @@ describe "Guilds", ->
         userToBecomeLeader = undefined
         request.post(baseURL + "/groups").send(
           name: "TestGuildToEmptyAndAssignLeader"
-          type: "guild"
+          type: "guild",
+          privacy: "public"
         ).end (res) ->
           guildToEmptyAndAssignLeader = res.body
           #Add members to guild

website/src/models/group.js

@@ -424,6 +424,9 @@ GroupSchema.methods.leave = function(user, keep, mainCb){
         var seniorMember = _.find(group.members, function (m) {return m != user._id});
         // If the leader is leaving (or if the leader previously left, and this wasn't accounted for)
         var leader = group.leader;
+
+        // could not exist in case of public guild with 1 member who is leaving
+        if(seniorMember){
           if (leader == user._id || !~group.members.indexOf(leader)) {
             update['$set'] = update['$set'] || {};
             update['$set'].leader = seniorMember;
@@ -435,6 +438,7 @@ GroupSchema.methods.leave = function(user, keep, mainCb){
             update['$set'] = update['$set'] || {};
             update['$set']['quest.leader'] = seniorMember;
           }
+        }
 
         update['$inc'] = {memberCount: -1};
         Group.update({_id:group._id}, update, cb);