diff --git a/libs/sysplugins/smarty_internal_resource_file.php b/libs/sysplugins/smarty_internal_resource_file.php
index 92b1a97e..3d241e70 100644
--- a/libs/sysplugins/smarty_internal_resource_file.php
+++ b/libs/sysplugins/smarty_internal_resource_file.php
@@ -172,10 +172,8 @@ class Smarty_Internal_Resource_File extends Smarty_Resource
         if ($source->exists) {
             return file_get_contents($source->filepath);
         }
-        if ($source instanceof Smarty_Template_Config) {
-            throw new SmartyException("Unable to read config {$source->type} '{$source->name}'");
-        }
-        throw new SmartyException("Unable to read template {$source->type} '{$source->name}'");
+        throw new SmartyException('Unable to read ' . ($source->isConfig ? 'config' : 'template') .
+                                  " {$source->type} '{$source->name}'");
     }
 
     /**