diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index 88486028894..be1d4d45cdc 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -5693,7 +5693,7 @@ abstract class CommonObject
 			$linealreadyfound = 0;
 
 			// Check if there is already a line for this object (in most cases, it is, but sometimes it is not, for example when extra field has been created after), so we must keep this overload)
-			$sql .= "SELECT COUNT(rowid) as nb FROM ".MAIN_DB_PREFIX.$this->table_element."_extrafields WHERE fk_object = ".$this->id;
+			$sql = "SELECT COUNT(rowid) as nb FROM ".MAIN_DB_PREFIX.$this->table_element."_extrafields WHERE fk_object = ".$this->id;
 			$resql = $this->db->query($sql);
 			if ($resql) {
 				$tmpobj = $this->db->fetch_object($resql);