diff --git a/htdocs/core/modules/product_batch/mod_lot_advanced.php b/htdocs/core/modules/product_batch/mod_lot_advanced.php
index d56178697f5..0865ebc9a66 100644
--- a/htdocs/core/modules/product_batch/mod_lot_advanced.php
+++ b/htdocs/core/modules/product_batch/mod_lot_advanced.php
@@ -65,6 +65,9 @@ class mod_lot_advanced extends ModeleNumRefBatch
 
 		$form = new Form($db);
 
+		// We get cursor rule
+		$mask = isset($conf->global->LOT_ADVANCED_MASK) ? $conf->global->LOT_ADVANCED_MASK : '';
+
 		$texte = $langs->trans('GenericNumRefModelDesc')."<br>\n";
 		$texte .= '<form action="'.$_SERVER["PHP_SELF"].'" method="POST">';
 		$texte .= '<input type="hidden" name="token" value="'.newToken().'">';
@@ -80,13 +83,13 @@ class mod_lot_advanced extends ModeleNumRefBatch
 
 		// Parametrage du prefix
 		$texte .= '<tr><td>'.$langs->trans("Mask").':</td>';
-		$texte .= '<td class="right">'.$form->textwithpicto('<input type="text" class="flat minwidth175" name="maskLot" value="'.$conf->global->LOT_ADVANCED_MASK.'">', $tooltip, 1, 1).'</td>';
+		$texte .= '<td class="right">'.$form->textwithpicto('<input type="text" class="flat minwidth175" name="maskLot" value="'.$mask.'">', $tooltip, 1, 1).'</td>';
 
 		$texte .= '<td class="left" rowspan="2">&nbsp; <input type="submit" class="button button-edit" name="Button" value="'.$langs->trans("Modify").'"></td>';
 
 		// Option to enable custom masks per product
 		$texte .= '<td class="right">';
-		if ($conf->global->PRODUCTBATCH_LOT_USE_PRODUCT_MASKS) {
+		if (!empty($conf->global->PRODUCTBATCH_LOT_USE_PRODUCT_MASKS)) {
 			$texte .= '<a class="reposition" href="'.$_SERVER["PHP_SELF"].'?action=setmaskslot&token='.newToken().'&value=0">'.img_picto($langs->trans("Enabled"), 'on').'</a>';
 		} else {
 			$texte .= '<a class="reposition" href="'.$_SERVER["PHP_SELF"].'?action=setmaskslot&token='.newToken().'&value=1">'.img_picto($langs->trans("Disabled"), 'off').'</a>';
@@ -139,7 +142,7 @@ class mod_lot_advanced extends ModeleNumRefBatch
 		require_once DOL_DOCUMENT_ROOT.'/core/lib/functions2.lib.php';
 
 		// We get cursor rule
-		$mask = $conf->global->LOT_ADVANCED_MASK;
+		$mask = isset($conf->global->LOT_ADVANCED_MASK) ? $conf->global->LOT_ADVANCED_MASK : '';
 
 		if (!$mask) {
 			$this->error = 'NotConfigured';
diff --git a/htdocs/core/modules/product_batch/mod_sn_advanced.php b/htdocs/core/modules/product_batch/mod_sn_advanced.php
index 6ee931d51a9..46f803cb20f 100644
--- a/htdocs/core/modules/product_batch/mod_sn_advanced.php
+++ b/htdocs/core/modules/product_batch/mod_sn_advanced.php
@@ -65,6 +65,9 @@ class mod_sn_advanced extends ModeleNumRefBatch
 
 		$form = new Form($db);
 
+		// We get cursor rule
+		$mask = isset($conf->global->SN_ADVANCED_MASK) ? $conf->global->SN_ADVANCED_MASK : '';
+
 		$texte = $langs->trans('GenericNumRefModelDesc')."<br>\n";
 		$texte .= '<form action="'.$_SERVER["PHP_SELF"].'" method="POST">';
 		$texte .= '<input type="hidden" name="token" value="'.newToken().'">';
@@ -80,13 +83,13 @@ class mod_sn_advanced extends ModeleNumRefBatch
 
 		// Parametrage du prefix
 		$texte .= '<tr><td>'.$langs->trans("Mask").':</td>';
-		$texte .= '<td class="right">'.$form->textwithpicto('<input type="text" class="flat minwidth175" name="maskSN" value="'.$conf->global->SN_ADVANCED_MASK.'">', $tooltip, 1, 1).'</td>';
+		$texte .= '<td class="right">'.$form->textwithpicto('<input type="text" class="flat minwidth175" name="maskSN" value="'.$mask.'">', $tooltip, 1, 1).'</td>';
 
 		$texte .= '<td class="left" rowspan="2">&nbsp; <input type="submit" class="button button-edit" name="Button" value="'.$langs->trans("Modify").'"></td>';
 
 		// Option to enable custom masks per product
 		$texte .= '<td class="right">';
-		if ($conf->global->PRODUCTBATCH_SN_USE_PRODUCT_MASKS) {
+		if (!empty($conf->global->PRODUCTBATCH_SN_USE_PRODUCT_MASKS)) {
 			$texte .= '<a class="reposition" href="'.$_SERVER["PHP_SELF"].'?action=setmaskssn&token='.newToken().'&value=0">'.img_picto($langs->trans("Enabled"), 'on').'</a>';
 		} else {
 			$texte .= '<a class="reposition" href="'.$_SERVER["PHP_SELF"].'?action=setmaskssn&token='.newToken().'&value=1">'.img_picto($langs->trans("Disabled"), 'off').'</a>';
@@ -139,7 +142,7 @@ class mod_sn_advanced extends ModeleNumRefBatch
 		require_once DOL_DOCUMENT_ROOT.'/core/lib/functions2.lib.php';
 
 		// We get cursor rule
-		$mask = $conf->global->SN_ADVANCED_MASK;
+		$mask = isset($conf->global->SN_ADVANCED_MASK) ? $conf->global->SN_ADVANCED_MASK : '';
 
 		if (!$mask)	{
 			$this->error = 'NotConfigured';