diff --git a/langfilter/langfilter.php b/langfilter/langfilter.php
index e5efa8fb..2bf986f0 100644
--- a/langfilter/langfilter.php
+++ b/langfilter/langfilter.php
@@ -7,7 +7,6 @@
  * License: MIT
  */
 
-use Friendica\App;
 use Friendica\Content\Text\BBCode;
 use Friendica\Core\Hook;
 use Friendica\Core\Renderer;
@@ -148,6 +147,8 @@ function langfilter_prepare_body_content_filter(&$hook_data)
 
 	$iso639 = new Matriphe\ISO639\ISO639;
 
+	$confidence = null;
+
 	// Extract the language of the post
 	if (!empty($hook_data['item']['language'])) {
 		$languages = json_decode($hook_data['item']['language'], true);