diff --git a/NEWS b/NEWS
index 3c56d9ac..44f8944a 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,4 @@
+    - fixed warning message in function.assign_debug_info (Monte)
     - fixed $template_dir, $compile_dir, $cache_dir, $config_dir
       to respect include_path (Monte)
     - fixed warning message with output filter array (Monte)
diff --git a/libs/plugins/function.assign_debug_info.php b/libs/plugins/function.assign_debug_info.php
index e1e31905..8bc9a897 100644
--- a/libs/plugins/function.assign_debug_info.php
+++ b/libs/plugins/function.assign_debug_info.php
@@ -12,7 +12,7 @@ function smarty_function_assign_debug_info($params, &$smarty)
 {
     $assigned_vars = $smarty->_tpl_vars;
     ksort($assigned_vars);
-    if (is_array($smarty->_config[0])) {
+    if (@is_array($smarty->_config[0])) {
         $config_vars = $smarty->_config[0];
         ksort($config_vars);
         $smarty->assign("_debug_config_keys", array_keys($config_vars));
diff --git a/plugins/function.assign_debug_info.php b/plugins/function.assign_debug_info.php
index e1e31905..8bc9a897 100644
--- a/plugins/function.assign_debug_info.php
+++ b/plugins/function.assign_debug_info.php
@@ -12,7 +12,7 @@ function smarty_function_assign_debug_info($params, &$smarty)
 {
     $assigned_vars = $smarty->_tpl_vars;
     ksort($assigned_vars);
-    if (is_array($smarty->_config[0])) {
+    if (@is_array($smarty->_config[0])) {
         $config_vars = $smarty->_config[0];
         ksort($config_vars);
         $smarty->assign("_debug_config_keys", array_keys($config_vars));