diff --git a/Smarty_Compiler.class.php b/Smarty_Compiler.class.php
index 40178f7a..ff3ef881 100644
--- a/Smarty_Compiler.class.php
+++ b/Smarty_Compiler.class.php
@@ -924,6 +924,7 @@ class Smarty_Compiler extends Smarty {
 
                 default:
                     if($this->security &&
+                       $i+1 < count($tokens) &&
                        $tokens[$i+1] == '(' &&
                        preg_match('!^[a-zA-Z_]\w+$!', $tokens[$i]) &&
                        !in_array($tokens[$i], $this->security_settings['IF_FUNCS'])) {
diff --git a/libs/Smarty_Compiler.class.php b/libs/Smarty_Compiler.class.php
index 40178f7a..ff3ef881 100644
--- a/libs/Smarty_Compiler.class.php
+++ b/libs/Smarty_Compiler.class.php
@@ -924,6 +924,7 @@ class Smarty_Compiler extends Smarty {
 
                 default:
                     if($this->security &&
+                       $i+1 < count($tokens) &&
                        $tokens[$i+1] == '(' &&
                        preg_match('!^[a-zA-Z_]\w+$!', $tokens[$i]) &&
                        !in_array($tokens[$i], $this->security_settings['IF_FUNCS'])) {