diff --git a/src/Hook/Hook.php b/src/Hook/Hook.php
index 699a7b4..038a86d 100644
--- a/src/Hook/Hook.php
+++ b/src/Hook/Hook.php
@@ -245,7 +245,7 @@ private function _runAction($action, $args) {
                 return call_user_func_array([$obj, $method], $args);
             }
 
-        } else {
+        } else if (class_exists($class)) {
 
             $instance = new $class;