diff --git a/templates/web/thesaurus/properties.html.twig b/templates/web/thesaurus/properties.html.twig
index 106e51ab2d..574e925b97 100644
--- a/templates/web/thesaurus/properties.html.twig
+++ b/templates/web/thesaurus/properties.html.twig
@@ -134,7 +134,6 @@
             parms += "&newlng=" + encodeURIComponent(lng);
 
             ret = loadXMLDoc(url, parms, true);
-            alert(ret);
             sy_list = ret.getElementsByTagName("sy_list").item(0);
 
             refresh_sy(sy_list);