diff --git a/change_log.txt b/change_log.txt
index 530ff8b9..032010a9 100644
--- a/change_log.txt
+++ b/change_log.txt
@@ -1,3 +1,6 @@
+24/03/2010
+- bugfix on register->modifier() error messages
+
 23/03/2010
 - bugfix on template inheritance when calling multiple child/parent relations
 - bugfix on caching mode SMARTY_CACHING_LIFETIME_SAVED and cache_lifetime = 0
diff --git a/libs/sysplugins/smarty_internal_register.php b/libs/sysplugins/smarty_internal_register.php
index 67df1918..fb43d6fc 100644
--- a/libs/sysplugins/smarty_internal_register.php
+++ b/libs/sysplugins/smarty_internal_register.php
@@ -108,9 +108,9 @@ class Smarty_Internal_Register {
     function modifier($modifier_name, $modifier_impl)
     {
         if (isset($this->smarty->registered_plugins['modifier'][$modifier_name])) {
-            throw new Exception("Plugin \"{$modifier}\" already registered");
+            throw new Exception("Plugin \"{$modifier_name}\" already registered");
         } elseif (!is_callable($modifier_impl)) {
-            throw new Exception("Plugin \"{$modifier}\" not callable");
+            throw new Exception("Plugin \"{$modifier_name}\" not callable");
         } else {
             $this->smarty->registered_plugins['modifier'][$modifier_name] =
             array($modifier_impl);