diff --git a/inc/form_language.class.php b/inc/form_language.class.php
index 98f9d0da5..002f0b693 100644
--- a/inc/form_language.class.php
+++ b/inc/form_language.class.php
@@ -111,10 +111,12 @@ public static function displayTabContentForItem(CommonGLPI $item, $tabnum = 1, $
    }
 
    public function prepareInputForAdd($input) {
+      global $CFG_GLPI;
+
       $formFk = PluginFormcreatorForm::getForeignKeyField();
       if (!isset($input['name'])) {
          Session::addMessageAfterRedirect(
-            __('The name cannot be empty!', 'formcreator'),
+            __('The name cannot be empty.', 'formcreator'),
             false,
             ERROR
          );
@@ -122,7 +124,15 @@ public function prepareInputForAdd($input) {
       }
       if (!isset($input[$formFk])) {
          Session::addMessageAfterRedirect(
-            __('The language must be associated to a form!', 'formcreator'),
+            __('The language must be associated to a form.', 'formcreator'),
+            false,
+            ERROR
+         );
+         return [];
+      }
+      if (!isset($CFG_GLPI['languages'][$input['name']])) {
+         Session::addMessageAfterRedirect(
+            __('The specified language is not available.', 'formcreator'),
             false,
             ERROR
          );