diff --git a/src/sonic_ax_impl/mibs/ietf/rfc2737.py b/src/sonic_ax_impl/mibs/ietf/rfc2737.py
index b0aa7fa9add2..dc63f4c9a7bf 100644
--- a/src/sonic_ax_impl/mibs/ietf/rfc2737.py
+++ b/src/sonic_ax_impl/mibs/ietf/rfc2737.py
@@ -675,7 +675,7 @@ def _update_per_namespace_data(self, pubsub):
 
             db_entry = msg["channel"].split(":")[-1]
             data = msg['data']  # event data
-            if not isinstance(data, bytes):
+            if not isinstance(data, str):
                 continue
 
             # extract interface name