Index: modules/in-commerce/units/products/products_tag_processor.php
===================================================================
--- modules/in-commerce/units/products/products_tag_processor.php
+++ modules/in-commerce/units/products/products_tag_processor.php
@@ -297,7 +297,8 @@
 			$link_params = Array('m_cat_id' => $object->GetDBField('CategoryId'), 'pass' => 'm,p,ord', 'ord_event' => 'OnAddToCart');
 		}
 
-		$this->Application->SetVar('p_id', $this->Application->GetVar($this->getPrefixSpecial().'_id'));
+		$link_params['p_id'] = $object->GetID();
+
 		return $this->Application->HREF($t, '', $link_params);
 	}