diff --git a/htdocs/compta/facture/class/facture.class.php b/htdocs/compta/facture/class/facture.class.php
index 6f09b27e53c..1e58f11aeb0 100644
--- a/htdocs/compta/facture/class/facture.class.php
+++ b/htdocs/compta/facture/class/facture.class.php
@@ -4905,7 +4905,7 @@ class Facture extends CommonInvoice
 
 	/**
 	 * @param	int			$rounding		Minimum number of decimal to show. If 0, no change, if -1, we use min($conf->global->MAIN_MAX_DECIMALS_UNIT,$conf->global->MAIN_MAX_DECIMALS_TOT)
-	 * @return number or -1 if not available
+	 * @return float or -1 if not available
 	 */
 	public function getRetainedWarrantyAmount($rounding = -1)
 	{
diff --git a/htdocs/ticket/class/ticket.class.php b/htdocs/ticket/class/ticket.class.php
index 9ee7d2c81b6..9c95e56870a 100644
--- a/htdocs/ticket/class/ticket.class.php
+++ b/htdocs/ticket/class/ticket.class.php
@@ -1016,6 +1016,19 @@ class Ticket extends CommonObject
 			}
 		}
 
+		// Delete all child tables
+
+		if (!$error) {
+			$sql = "DELETE FROM ".MAIN_DB_PREFIX."categorie_ticket";
+			$sql .= " WHERE fk_ticket = ".(int) $this->id;
+
+			$result = $this->db->query($sql);
+			if (!$result) {
+				$error++;
+				$this->errors[] = $this->db->lasterror();
+			}
+		}
+
 		if (!$error) {
 			$sql = "DELETE FROM ".MAIN_DB_PREFIX."ticket";
 			$sql .= " WHERE rowid=".((int) $this->id);