diff --git a/server/src/main/resources/web/bpmn.ftl b/server/src/main/resources/web/bpmn.ftl
index 756562a1..1b2c523d 100644
--- a/server/src/main/resources/web/bpmn.ftl
+++ b/server/src/main/resources/web/bpmn.ftl
@@ -41,7 +41,7 @@
     const viewer = new BpmnJS({
         container: '#diagram'
     });
-	var url = '${finalUrl}';
+	var url = '${finalUrl?js_string}';
 	var kkagent = '${kkagent}';
     var baseUrl = '${baseUrl}'.endsWith('/') ? '${baseUrl}' : '${baseUrl}' + '/';
     if (kkagent === 'true' || !url.startsWith(baseUrl)) {