diff --git a/libs/Smarty.class.php b/libs/Smarty.class.php
index d31652cf..c4227fd1 100644
--- a/libs/Smarty.class.php
+++ b/libs/Smarty.class.php
@@ -1424,10 +1424,10 @@ class Smarty
                 }
             }
         } else if ($resource_type != 'file') {
-            $readable = true;
 			$template_source = null;
-            $resource_func = $this->_plugins['resource'][$resource_type][0][0];
-            $readable = $resource_func($resource_name, $template_source, $this);
+            $readable = $this->_plugin_implementation_exists($this->_plugins['resource'][$resource_type][0][0])
+                && call_user_func_array($this->_plugins['resource'][$resource_type][0][0],
+                                        array($resource_name, &$template_source, &$this));
         }
 
         /*
@@ -1456,7 +1456,6 @@ class Smarty
         } else {
             $php_resource = $template_source;
         }
-
         return true;
     }