diff --git a/apps/sim/lib/copilot/request/session/contract.ts b/apps/sim/lib/copilot/request/session/contract.ts
index 7953a11c95..2d116e87ce 100644
--- a/apps/sim/lib/copilot/request/session/contract.ts
+++ b/apps/sim/lib/copilot/request/session/contract.ts
@@ -165,6 +165,7 @@ function isStreamRef(value: unknown): value is MothershipStreamV1StreamRef {
   return (
     isRecord(value) &&
     typeof value.streamId === 'string' &&
+    value.streamId.length > 0 &&
     isOptionalString(value.chatId) &&
     isOptionalString(value.cursor)
   )