diff --git a/packages/server-runtime/src/middlewares/route.ts b/packages/server-runtime/src/middlewares/route.ts
index 0bbef2960..37e3824ed 100644
--- a/packages/server-runtime/src/middlewares/route.ts
+++ b/packages/server-runtime/src/middlewares/route.ts
@@ -79,7 +79,7 @@ export function createPolicyMiddleware(policy: RoutingPolicy): RouteMiddleware {
 }
 
 export function collectDestinations(event: WebSocketEvent | (Omit<WebSocketEvent, 'metadata'> & Partial<Pick<WebSocketEvent, 'metadata'>>)) {
-  if (event.route?.destinations !== undefined) {
+  if (event.route && 'destinations' in event.route) {
     return event.route.destinations
   }