diff --git a/content/page/labs/Domestic Object Transportation Laboratory/buttons.json b/content/page/labs/Domestic Object Transportation Laboratory/buttons.json
index 7ac3a79..9d7d316 100644
--- a/content/page/labs/Domestic Object Transportation Laboratory/buttons.json	
+++ b/content/page/labs/Domestic Object Transportation Laboratory/buttons.json	
@@ -118,8 +118,7 @@
       "value": "run",
       "description": "Run code on Binderhub.",
       "primary": true,
-      "url": "https://binder.intel4coro.de/v2/gh/sunava/pycram/e2d1c9feb35ca6997165ddbf9de171827ff6c2d5?urlpath=lab%2Ftree%2Fdemos%2Fpycram_virtual_building_demos%2Fstart_demo.ipynb
-",
+      "url": "https://binder.intel4coro.de/v2/gh/sunava/pycram/e2d1c9feb35ca6997165ddbf9de171827ff6c2d5?urlpath=lab%2Ftree%2Fdemos%2Fpycram_virtual_building_demos%2Fstart_demo.ipynb",
       "options": [
         "environments",
         "robots",