1 files changed, 5 insertions, 0 deletions
diff --git a/upgrade.php b/upgrade.php
index 55f2acf5a..dfb3c4c36 100644
--- a/upgrade.php
+++ b/upgrade.php
@@ -142,6 +142,11 @@ $languages = new languages('utf-8');
 if (isset($_GET['language']))
 {
   $language = strip_tags($_GET['language']);
+
+  if (!in_array($language, array_keys($languages->fs_languages)))
+  {
+    $language = PHPWG_DEFAULT_LANGUAGE;
+  }
 }
 else
 {