diff --git a/apps/emqx_gateway/src/mqttsn/emqx_sn_channel.erl b/apps/emqx_gateway/src/mqttsn/emqx_sn_channel.erl
index 9de86f101..e49a0dde8 100644
--- a/apps/emqx_gateway/src/mqttsn/emqx_sn_channel.erl
+++ b/apps/emqx_gateway/src/mqttsn/emqx_sn_channel.erl
@@ -183,6 +183,8 @@ info(ctx, #channel{ctx = Ctx}) ->
     Ctx.
 
 -spec(stats(channel()) -> emqx_types:stats()).
+stats(#channel{session = undefined})->
+    [];
 stats(#channel{session = Session})->
     emqx_session:stats(Session).