diff --git a/ui/src/components/ChatInterface.tsx b/ui/src/components/ChatInterface.tsx
index ee4b7263eadbca5c98da960469ebc4e83147222c..501a0f05cd24e7022180509c74112ea2e52b3ac0 100644
--- a/ui/src/components/ChatInterface.tsx
+++ b/ui/src/components/ChatInterface.tsx
@@ -461,6 +461,7 @@ function ChatInterface({
     } else {
       // No conversation yet, show empty state
       setMessages([]);
+      setContextWindowSize(0);
       setLoading(false);
     }