diff --git a/server/utils.py b/server/utils.py
index 52125fe1..60307487 100644
--- a/server/utils.py
+++ b/server/utils.py
@@ -194,7 +194,7 @@ def MakeFastAPIOffline(
                 index = i
                 break
         if isinstance(index, int):
-            app.routes.pop(i)
+            app.routes.pop(index)
 
     # Set up static file mount
     app.mount(