diff --git a/htdocs/core/modules/contract/modules_contract.php b/htdocs/core/modules/contract/modules_contract.php
index 35a03dd8337..fb03a8a8115 100644
--- a/htdocs/core/modules/contract/modules_contract.php
+++ b/htdocs/core/modules/contract/modules_contract.php
@@ -231,7 +231,7 @@ function contract_pdf_create($db, $object, $modele, $outputlangs, $hidedetails=0
 			include_once DOL_DOCUMENT_ROOT . '/core/class/interfaces.class.php';
 			$interface=new Interfaces($db);
 			$result=$interface->run_triggers('CONTRACT_BUILDDOC',$object,$user,$langs,$conf);
-			if ($result < 0) { $error++; $this->errors=$interface->errors; }
+			if ($result < 0) { $error++; $obj->errors=$interface->errors; }
 			// Fin appel triggers
 
 			return 1;