diff --git a/app.js b/app.js
index 8175dd2..0e144d3 100644
--- a/app.js
+++ b/app.js
@@ -52,8 +52,7 @@ function handle_application_command(state, data, channel_id) {
 
         default:
             console.error(`unknown command: ${name}`);
-            if (res) return res.status(400).json({ error: "unknown command" });
-            else return null;
+            return state.res.status(400).json({ error: "unknown command" });
     }
 }