fixes #13

Author: tabacitu

src/app/Models/MenuItem.php

@@ -63,7 +63,7 @@ public function url()
                 break;
 
             case 'internal_link':
-                return url($this->link);
+                return is_null($this->link) ? "#" : url($this->link);
                 break;
 
             default: //page_link