diff --git a/apps/emqx_rule_engine/src/emqx_rule_engine_api.erl b/apps/emqx_rule_engine/src/emqx_rule_engine_api.erl
index 1c391525f..3f13b64a3 100644
--- a/apps/emqx_rule_engine/src/emqx_rule_engine_api.erl
+++ b/apps/emqx_rule_engine/src/emqx_rule_engine_api.erl
@@ -334,7 +334,7 @@ update_resource(#{id := Id}, NewParams) ->
     end,
     P2 = case proplists:get_value(<<"config">>, NewParams) of
         undefined -> #{};
-        <<"{}">> -> #{};
+        [{}] -> #{};
         Map -> #{<<"config">> => ?RAISE(maps:from_list(Map), {invalid_config, Map})}
     end,
     case emqx_rule_engine:update_resource(Id, maps:merge(P1, P2)) of
@@ -342,13 +342,13 @@ update_resource(#{id := Id}, NewParams) ->
             return(ok);
         {error, not_found} ->
             ?LOG(error, "resource not found: ~0p", [Id]),
-            return({error, 400, list_to_binary("resource not found:" ++ binary_to_list(Id))});
+            return({error, 400, <<"resource not found:", Id/binary>>});
         {error, {init_resource_failure, _}} ->
             ?LOG(error, "init resource failure: ~0p", [Id]),
-            return({error, 500, list_to_binary("init resource failure:" ++ binary_to_list(Id))});
+            return({error, 500, <<"init resource failure:", Id/binary>>});
         {error, {dependency_exists, RuleId}} ->
             ?LOG(error, "dependency exists: ~0p", [RuleId]),
-            return({error, 500, list_to_binary("resource dependency by rule:" ++ binary_to_list(RuleId))});
+            return({error, 500, <<"resource dependency by rule:", RuleId/binary>>});
         {error, Reason} ->
             ?LOG(error, "update resource failed: ~0p", [Reason]),
             return({error, 500, <<"update resource failed,error info have been written to logfile!">>})