1 files changed, 5 insertions, 0 deletions
diff --git a/upgrade.php b/upgrade.php
index 43cf70b7a..ea0bbe516 100644
--- a/upgrade.php
+++ b/upgrade.php
@@ -154,6 +154,11 @@ $languages = new languages('utf-8');
 if (isset($_GET['language']))
 {
   $language = strip_tags($_GET['language']);
+
+  if (!in_array($language, array_keys($languages->fs_languages)))
+  {
+    $language = PHPWG_DEFAULT_LANGUAGE;
+  }
 }
 else
 {