diff --git a/services/real-time/app/js/Router.js b/services/real-time/app/js/Router.js
index e683c0d261ba..7d68a6911a50 100644
--- a/services/real-time/app/js/Router.js
+++ b/services/real-time/app/js/Router.js
@@ -33,7 +33,7 @@ const applyOtUpdateSchema = z.object({
     lastV: z.number().optional(),
     meta: z
       .strictObject({
-        tc: z.string(),
+        tc: z.string().optional(),
       })
       .optional(),
     op: z