Merge pull request #5765 from hregis/3.9_bug

Fix: Using $this when not in object context

htdocs/core/actions_sendmails.inc.php

@@ -313,7 +313,7 @@ if (($action == 'send' || $action == 'relance') && ! $_POST['addfile'] && ! $_PO
 					$interface=new Interfaces($db);
 					$result=$interface->run_triggers($trigger_name,$object,$user,$langs,$conf);
 					if ($result < 0) {
-						$error++; $this->errors=$interface->errors;
+						$error++; $errors=$interface->errors;
 					}
 					// End call of triggers