diff --git a/classes/Link.php b/classes/Link.php
index 80863ee16..0a0c98322 100644
--- a/classes/Link.php
+++ b/classes/Link.php
@@ -129,8 +129,8 @@ class LinkCore
 			$params['tags'] = Tools::str2url($product->getTags($id_lang));
 		
 		if ($dispatcher->hasKeyword('product_rule', $id_lang, 'category'))
-			$params['category'] = Tools::str2url($product->category);
-		
+			$params['category'] = !is_null($product->category) ? Tools::str2url($product->category) : Tools::str2url($category);
+
 		if ($dispatcher->hasKeyword('product_rule', $id_lang, 'reference'))
 			$params['reference'] = Tools::str2url($product->reference);