diff --git a/htdocs/product/class/productcustomerprice.class.php b/htdocs/product/class/productcustomerprice.class.php
index 1bca4579070..dd072e19a2f 100644
--- a/htdocs/product/class/productcustomerprice.class.php
+++ b/htdocs/product/class/productcustomerprice.class.php
@@ -351,8 +351,9 @@ class Productcustomerprice extends CommonObject
 				}
 			}
 		}
-
-		$sql.= $this->db->order($sortfield, $sortorder);
+		if (!empty($sortfield)) {
+			$sql.= $this->db->order($sortfield, $sortorder);
+		}
 		if (! empty($limit)) $sql .= ' ' . $this->db->plimit($limit + 1, $offset);
 
 		dol_syslog(get_class($this) . "::fetch_all", LOG_DEBUG);