diff --git a/app/code/core/Mage/Catalog/Model/Product/Option/Type/File.php b/app/code/core/Mage/Catalog/Model/Product/Option/Type/File.php
index 1c0b970b3b9..7f9e039d90f 100644
--- a/app/code/core/Mage/Catalog/Model/Product/Option/Type/File.php
+++ b/app/code/core/Mage/Catalog/Model/Product/Option/Type/File.php
@@ -545,7 +545,8 @@ protected function _unserializeValue($value)
      */
     public function getPrintableOptionValue($optionValue)
     {
-        return strip_tags($this->getFormattedOptionValue($optionValue));
+        $value = $this->getFormattedOptionValue($optionValue);
+        return $value === null ? '' : strip_tags($value);
     }
 
     /**