diff --git a/htdocs/core/class/html.formadmin.class.php b/htdocs/core/class/html.formadmin.class.php
index 13619fe5aa3..05c5fe3a9ea 100644
--- a/htdocs/core/class/html.formadmin.class.php
+++ b/htdocs/core/class/html.formadmin.class.php
@@ -75,7 +75,7 @@ class FormAdmin
 
 		// If the language to select is not inside the list of available language and empty value is not available, we must find
 		// an alternative as the language code to pre-select (to avoid to have first element in list pre-selected).
-		if ($selected && !in_array($selected, $langs_available) && empty($showempty)) {
+		if ($selected && !array_key_exists($selected, $langs_available) && empty($showempty)) {
 			$tmparray = explode('_', $selected);
 			if (!empty($tmparray[1])) {
 				$selected = getLanguageCodeFromCountryCode($tmparray[1]);