diff --git a/apps/emqx_dashboard/src/emqx_dashboard_admin.erl b/apps/emqx_dashboard/src/emqx_dashboard_admin.erl
index e77204541..e262cf389 100644
--- a/apps/emqx_dashboard/src/emqx_dashboard_admin.erl
+++ b/apps/emqx_dashboard/src/emqx_dashboard_admin.erl
@@ -230,7 +230,7 @@ remove_user(Username) ->
 
 -spec update_user(dashboard_username(), dashboard_user_role(), binary()) ->
     {ok, map()} | {error, term()}.
-update_user(Username, Role, Desc) when is_binary(Username) ->
+update_user(Username, Role, Desc) ->
     case legal_role(Role) of
         ok ->
             case
diff --git a/apps/emqx_dashboard/src/emqx_dashboard_api.erl b/apps/emqx_dashboard/src/emqx_dashboard_api.erl
index 70d6accb4..9ee07dc06 100644
--- a/apps/emqx_dashboard/src/emqx_dashboard_api.erl
+++ b/apps/emqx_dashboard/src/emqx_dashboard_api.erl
@@ -379,9 +379,9 @@ sso_parameters() ->
 sso_parameters(Params) ->
     emqx_dashboard_sso_api:sso_parameters(Params).
 
-username(#{bindings := #{backend := local}}, Username) ->
+username(#{query_string := #{<<"backend">> := local}}, Username) ->
     Username;
-username(#{bindings := #{backend := Backend}}, Username) ->
+username(#{query_string := #{<<"backend">> := Backend}}, Username) ->
     ?SSO_USERNAME(Backend, Username);
 username(_Req, Username) ->
     Username.