diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index 4d3c39027ac..00306939cdb 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -1701,7 +1701,7 @@ abstract class CommonObject
 
 		$idtype = $this->barcode_type;
 		if (empty($idtype) && $idtype != '0') {	// If type of barcode no set, we try to guess. If set to '0' it means we forced to have type remain not defined
-			if ($this->element == 'product') {
+			if ($this->element == 'product' && !empty($conf->global->PRODUIT_DEFAULT_BARCODE_TYPE)) {
 				$idtype = $conf->global->PRODUIT_DEFAULT_BARCODE_TYPE;
 			} elseif ($this->element == 'societe') {
 				$idtype = $conf->global->GENBARCODE_BARCODETYPE_THIRDPARTY;