diff --git a/libs/sysplugins/smarty_internal_compile_assign.php b/libs/sysplugins/smarty_internal_compile_assign.php
index 4b998488..1f0ab9b7 100644
--- a/libs/sysplugins/smarty_internal_compile_assign.php
+++ b/libs/sysplugins/smarty_internal_compile_assign.php
@@ -83,7 +83,7 @@ class Smarty_Internal_Compile_Assign extends Smarty_Internal_CompileBase
         if (isset($parameter[ 'smarty_internal_index' ])) {
             $output =
                 "<?php \$_tmp_array = isset(\$_smarty_tpl->tpl_vars[{$_var}]) ? \$_smarty_tpl->tpl_vars[{$_var}]->value : array();\n";
-            $output .= "if (!is_array(\$_tmp_array) || \$_tmp_array instanceof ArrayAccess) {\n";
+            $output .= "if (!(is_array(\$_tmp_array) || \$_tmp_array instanceof ArrayAccess)) {\n";
             $output .= "settype(\$_tmp_array, 'array');\n";
             $output .= "}\n";
             $output .= "\$_tmp_array{$parameter['smarty_internal_index']} = {$_attr['value']};\n";