Create requires an object

// FREEBIE

js/conversation_controller.js

@@ -46,6 +46,9 @@
             return conversations.get(id);
         },
         create: function(attrs) {
+            if (typeof attrs !== 'object') {
+                throw new Error('ConversationController.create requires an object, got', attrs);
+            }
             var conversation = conversations.add(attrs);
             return conversation;
         },

js/models/messages.js

@@ -103,7 +103,7 @@
             }
             var c = ConversationController.get(conversationId);
             if (!c) {
-                c = ConversationController.create(conversationId);
+                c = ConversationController.create({id: conversationId});
                 c.fetch();
             }
             return c;