// small fix

classes/Hook.php

@@ -390,6 +390,10 @@ class HookCore extends ObjectModel
 	 */
 	public static function exec($hook_name, $hook_args = array(), $id_module = null, $array_return = false, $check_exceptions = true, $use_push = false)
 	{
+		static $disable_non_native_modules = null;
+		if ($disable_non_native_modules === null)
+			$disable_non_native_modules = (bool)Configuration::get('PS_DISABLE_NON_NATIVE_MODULE');
+
 		// Check arguments validity
 		if (($id_module && !is_numeric($id_module)) || !Validate::isHookName($hook_name))
 			throw new PrestaShopException('Invalid id_module or hook_name');
@@ -419,7 +423,7 @@ class HookCore extends ObjectModel
 		$altern = 0;
 		$output = '';
 
-		if (!isset(Hook::$native_module))
+		if ($disable_non_native_modules && !isset(Hook::$native_module))
 			Hook::$native_module = Module::getNativeModuleList();
 
 		foreach ($module_list as $array)
@@ -428,7 +432,7 @@ class HookCore extends ObjectModel
 			if ($id_module && $id_module != $array['id_module'])
 				continue;
 
-			if ((bool)Configuration::get('PS_DISABLE_NON_NATIVE_MODULE') && !in_array($array['module'], self::$native_module))
+			if ((bool)$disable_non_native_modules && Hook::$native_module && count(Hook::$native_module) && !in_array($array['module'], self::$native_module))
 				continue;
 
 			if (!($moduleInstance = Module::getInstanceByName($array['module'])))

classes/module/Module.php

@@ -1309,6 +1309,9 @@ abstract class ModuleCore
 	public static function getNativeModuleList()
 	{
 		$module_list_xml = _PS_ROOT_DIR_.self::CACHE_FILE_MODULES_LIST;
+		if (!file_exists($module_list_xml))
+			return false;
+
 		$native_modules = simplexml_load_file($module_list_xml);
 		$native_modules = $native_modules->modules;
 		$modules = array();