diff --git a/htdocs/product/class/product.class.php b/htdocs/product/class/product.class.php
index bd3cf69c86a..8ff89d8d086 100644
--- a/htdocs/product/class/product.class.php
+++ b/htdocs/product/class/product.class.php
@@ -1690,7 +1690,11 @@ class Product extends CommonObject
 		$testExit = array('multiprices','multiprices_ttc','multiprices_base_type','multiprices_min','multiprices_min_ttc','multiprices_tva_tx','multiprices_recuperableonly');
 
 		foreach ($testExit as $field) {
-			if (!isset($this->$field[$level])) {
+			if (!isset($this->$field)) {
+				return array();
+			}
+			$tmparray = $this->$field;
+			if (!isset($tmparray[$level])) {
 				return array();
 			}
 		}
diff --git a/htdocs/resource/class/html.formresource.class.php b/htdocs/resource/class/html.formresource.class.php
index 99916b8ed70..a541dfab700 100644
--- a/htdocs/resource/class/html.formresource.class.php
+++ b/htdocs/resource/class/html.formresource.class.php
@@ -1,6 +1,7 @@
 <?php
 /* Copyright (C) - 2013-2015 Jean-François FERRY	<jfefe@aternatik.fr>
  * Copyright (C) 2019       Frédéric France         <frederic.france@netlogic.fr>
+ * Copyright (C) 2022       Ferran Marcet           <fmarcet@2byte.es>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -224,9 +225,11 @@ class FormResource
 					$value = ($maxlength ?dol_trunc($arraytypes['label'], $maxlength) : $arraytypes['label']);
 				} elseif ($format == 3) {
 					$value = $arraytypes['code'];
-				} elseif (empty($value)) {
-					print  '&nbsp;';
 				}
+				if (empty($value)) {
+					$value = '&nbsp;';
+				}
+				print $value;
 				print '</option>';
 			}
 		}