diff --git a/web/src/lib/squadCompletionObservation.ts b/web/src/lib/squadCompletionObservation.ts
index 23d84153..036c4bc5 100644
--- a/web/src/lib/squadCompletionObservation.ts
+++ b/web/src/lib/squadCompletionObservation.ts
@@ -33,7 +33,7 @@ export function isInflightChatStatus(status: string): boolean {
 type InflightCancelableMessage = {
   sessionId?: string;
   role: string;
-  status: string;
+  status?: string;
   livePhaseLabel?: string;
 };
 
@@ -50,6 +50,7 @@ export function cancelInflightAssistantMessages<T extends InflightCancelableMess
     if (
       message.sessionId === sessionId &&
       message.role === 'assistant' &&
+      message.status !== undefined &&
       isInflightChatStatus(message.status)
     ) {
       return {