diff --git a/src/services/response-queue.ts b/src/services/response-queue.ts
index 3de7c02..feb90f6 100644
--- a/src/services/response-queue.ts
+++ b/src/services/response-queue.ts
@@ -132,6 +132,7 @@ export const ResponseQueue = {
 							const n = normalizeWhatsAppId(String(m));
 							if (!n) continue;
 							const r = IdentityService.resolveAliasOrNull(n) || n;
+							if (!/^\d+$/.test(r)) continue;
 							resolved.push(`${r}@s.whatsapp.net`);
 						}
 						// Eliminar duplicados