diff --git a/change_log.txt b/change_log.txt
index 4e745526..fe71d9ab 100644
--- a/change_log.txt
+++ b/change_log.txt
@@ -5,6 +5,7 @@
 - bugfix a relative {include} in child template blocks failed
 - bugfix direct setting of $template_dir, $config_dir, $plugins_dir in __construct() of an 
   extended Smarty class created problems
+- bugfix error muting was not implemented for cache locking
 
 ===== Smarty 3.1.1  =====
 22.09.2011
diff --git a/libs/sysplugins/smarty_internal_cacheresource_file.php b/libs/sysplugins/smarty_internal_cacheresource_file.php
index 39c74ea7..896c7a41 100644
--- a/libs/sysplugins/smarty_internal_cacheresource_file.php
+++ b/libs/sysplugins/smarty_internal_cacheresource_file.php
@@ -227,7 +227,9 @@ class Smarty_Internal_CacheResource_File extends Smarty_CacheResource {
         } else {
             clearstatcache();
         }
+        Smarty::muteExpectedErrors();
         $t = @filemtime($cached->lock_id);
+        Smarty::unmuteExpectedErrors();
         return $t && (time() - $t < $smarty->locking_timeout);
     }