diff --git a/htdocs/categories/class/categorie.class.php b/htdocs/categories/class/categorie.class.php
index 8d26b5583d4..b222f70110a 100644
--- a/htdocs/categories/class/categorie.class.php
+++ b/htdocs/categories/class/categorie.class.php
@@ -703,13 +703,14 @@ class Categorie extends CommonObject
 			$type = $obj->element;
 		}
 
+		dol_syslog(get_class($this).'::add_type', LOG_DEBUG);
+
 		$this->db->begin();
 
 		$sql = "INSERT INTO ".MAIN_DB_PREFIX."categorie_".(empty($this->MAP_CAT_TABLE[$type]) ? $type : $this->MAP_CAT_TABLE[$type]);
 		$sql .= " (fk_categorie, fk_".(empty($this->MAP_CAT_FK[$type]) ? $type : $this->MAP_CAT_FK[$type]).")";
 		$sql .= " VALUES (".((int) $this->id).", ".((int) $obj->id).")";
 
-		dol_syslog(get_class($this).'::add_type', LOG_DEBUG);
 		if ($this->db->query($sql)) {
 			if (!empty($conf->global->CATEGORIE_RECURSIV_ADD)) {
 				$sql = 'SELECT fk_parent FROM '.MAIN_DB_PREFIX.'categorie';
diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index 6d460dfadf0..aead087a9bc 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -9954,7 +9954,7 @@ abstract class CommonObject
 			}
 		}
 
-		return $error ? -1 * $error : $ok;
+		return $error ? (-1 * $error) : $ok;
 	}
 
 	/**