diff --git a/htdocs/core/modules/societe/doc/doc_generic_odt.modules.php b/htdocs/core/modules/societe/doc/doc_generic_odt.modules.php
index 061eb082818..67b6e76998c 100644
--- a/htdocs/core/modules/societe/doc/doc_generic_odt.modules.php
+++ b/htdocs/core/modules/societe/doc/doc_generic_odt.modules.php
@@ -311,6 +311,7 @@ class doc_generic_odt extends ModeleThirdPartyDoc
 			}
 		}
 
+		$this->error='UnknownError';
 		return -1;
 	}