diff --git a/server/src/main/resources/web/tiff.ftl b/server/src/main/resources/web/tiff.ftl
index 1045c6b9..6a04fb4b 100644
--- a/server/src/main/resources/web/tiff.ftl
+++ b/server/src/main/resources/web/tiff.ftl
@@ -30,7 +30,7 @@
         var reg = new RegExp(str + "$");
         return reg.test(this);
     }
-    var url = '${finalUrl}';
+    var url = '${finalUrl?js_string}';
 	var kkagent = '${kkagent}';
     var baseUrl = '${baseUrl}'.endsWith('/') ? '${baseUrl}' : '${baseUrl}' + '/';
     if (kkagent === 'true' || !url.startsWith(baseUrl)) {