--- a/client/js/models.js	Tue Nov 13 11:46:39 2012 +0100
+++ b/client/js/models.js	Tue Nov 06 13:23:19 2012 +0100
@@ -88,7 +88,7 @@
                 description: this.get("description"),
                 position: this.get("position"),
                 image: this.get("image"),
-                created_by: this.get("created_by").get("_id")
+                created_by: this.get("created_by") ? this.get("created_by").get("_id") : null
             };
         },
     });
@@ -126,9 +126,9 @@
                 title: this.get("title"),
                 uri: this.get("uri"),
                 description: this.get("description"),
-                from: this.get("from").get("_id"),
-                to: this.get("to").get("_id"),
-                created_by: this.get("created_by").get("_id"),
+                from: this.get("from") ? this.get("from").get("_id") : null,
+                to: this.get("to") ? this.get("to").get("_id") : null,
+                created_by: this.get("created_by") ? this.get("created_by").get("_id") : null
             };
         },
     });