diff --git a/htdocs/categories/categorie.class.php b/htdocs/categories/categorie.class.php
index 61f3e84c5fc..65c9fc3e503 100644
--- a/htdocs/categories/categorie.class.php
+++ b/htdocs/categories/categorie.class.php
@@ -127,6 +127,9 @@ class Categorie
 		global $conf,$langs;
 		$langs->load('categories');
 
+		// Clean parameters
+		if (empty($this->visible)) $this->visible=0;
+
 		if ($this->already_exists())
 		{
 			$this->error=$langs->trans("ImpossibleAddCat");