diff --git a/server/src/main/resources/web/pdf.ftl b/server/src/main/resources/web/pdf.ftl
index 462d4c39..d8447ed0 100644
--- a/server/src/main/resources/web/pdf.ftl
+++ b/server/src/main/resources/web/pdf.ftl
@@ -46,7 +46,7 @@
 </#if>
 
 <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)) {