diff --git a/langgraph/src/main.tsx b/langgraph/src/main.tsx
index 78d8b81..4e9a398 100644
--- a/langgraph/src/main.tsx
+++ b/langgraph/src/main.tsx
@@ -95,6 +95,11 @@ function App() {
     return () => window.removeEventListener("open-canvas", handler);
   }, []);
 
+  // Clear error and stale stream state when thread switches
+  useEffect(() => {
+    thread.switchThread(currentThreadId);
+  }, [currentThreadId]); // eslint-disable-line react-hooks/exhaustive-deps
+
   // Sync concurrent status with thread loading state
   useEffect(() => {
     if (!thread.isLoading && concurrentStatus !== "cancelling") {