diff --git a/code/FileAttachmentField.php b/code/FileAttachmentField.php
index 7bc2b2f..529446f 100644
--- a/code/FileAttachmentField.php
+++ b/code/FileAttachmentField.php
@@ -801,7 +801,8 @@ public function upload(SS_HTTPRequest $request) {
         }
         
         // No files detected in the upload, this can occur if post_max_size is < the upload size
-        if(empty($files) || empty($request->postVar($name))) {
+        $value = $request->postVar($name);
+        if(empty($files) || empty($value)) {
           $error_message = _t('FileAttachmentField.NOFILESUPLOADED', 'No files were detected in your upload. Please try again later.');
           return $this->httpError(400, $error_message);
         }