diff --git a/apps/emqx_authn/src/simple_authn/emqx_authn_jwt.erl b/apps/emqx_authn/src/simple_authn/emqx_authn_jwt.erl
index 58c51facb..c82ec3d0a 100644
--- a/apps/emqx_authn/src/simple_authn/emqx_authn_jwt.erl
+++ b/apps/emqx_authn/src/simple_authn/emqx_authn_jwt.erl
@@ -441,6 +441,11 @@ check_claim_name(iat) ->
     false;
 check_claim_name(nbf) ->
     false;
+check_claim_name(Name) when
+    Name == <<>>;
+    Name == ""
+->
+    false;
 check_claim_name(_) ->
     true.