diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index 0c62d6e7e2a..fccbbfe9ed8 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -8165,7 +8165,7 @@ class Form
 
 				$oldValueForShowOnCombobox = 0;
 				foreach ($objecttmp->fields as $fieldK => $fielV) {
-					if (!$fielV['showoncombobox'] || empty($objecttmp->$fieldK)) {
+					if (empty($fielV['showoncombobox']) || empty($objecttmp->$fieldK)) {
 						continue;
 					}