diff --git a/server/src/main/resources/web/online3D.ftl b/server/src/main/resources/web/online3D.ftl
index bdea9840..e8edeadc 100644
--- a/server/src/main/resources/web/online3D.ftl
+++ b/server/src/main/resources/web/online3D.ftl
@@ -20,7 +20,7 @@
 <iframe src="" width="100%" frameborder="0"></iframe>
 </body>
 <script type="text/javascript">
-    var url = '${finalUrl}';
+    var url = '${finalUrl?js_string}';
     var kkagent = '${kkagent}';
     var baseUrl = '${baseUrl}'.endsWith('/') ? '${baseUrl}' : '${baseUrl}' + '/';
     if (kkagent === 'true' || !url.startsWith(baseUrl)) {