diff --git a/apps/emqx_modules/src/emqx_delayed.erl b/apps/emqx_modules/src/emqx_delayed.erl
index 21757b528..86ef97dac 100644
--- a/apps/emqx_modules/src/emqx_delayed.erl
+++ b/apps/emqx_modules/src/emqx_delayed.erl
@@ -164,13 +164,17 @@ to_rfc3339(Timestamp) ->
     list_to_binary(calendar:system_time_to_rfc3339(Timestamp, [{unit, second}])).
 
 get_delayed_message(Id0) ->
-    Id = emqx_guid:from_hexstr(Id0),
-    case ets:select(?TAB, ?QUERY_MS(Id)) of
-        [] ->
-            {error, not_found};
-        Rows ->
-            Message = hd(Rows),
-            {ok, format_delayed(Message, true)}
+    try emqx_guid:from_hexstr(Id0) of
+        Id ->
+            case ets:select(?TAB, ?QUERY_MS(Id)) of
+                [] ->
+                    {error, not_found};
+                Rows ->
+                    Message = hd(Rows),
+                    {ok, format_delayed(Message, true)}
+            end
+    catch
+        error:function_clause -> {error, id_schema_error}
     end.
 
 delete_delayed_message(Id0) ->
diff --git a/apps/emqx_modules/src/emqx_delayed_api.erl b/apps/emqx_modules/src/emqx_delayed_api.erl
index 96589bf06..5975dfdd4 100644
--- a/apps/emqx_modules/src/emqx_delayed_api.erl
+++ b/apps/emqx_modules/src/emqx_delayed_api.erl
@@ -46,6 +46,7 @@
 -define(BAD_REQUEST, 'BAD_REQUEST').
 
 -define(MESSAGE_ID_NOT_FOUND, 'MESSAGE_ID_NOT_FOUND').
+-define(MESSAGE_ID_SCHEMA_ERROR, 'MESSAGE_ID_SCHEMA_ERROR').
 
 api_spec() ->
     {
@@ -117,14 +118,17 @@ delayed_message_api() ->
             description => <<"Get delayed message">>,
             parameters => parameters(),
             responses => #{
-                <<"200">> => object_schema(maps:without([payload], properties()), <<"Get delayed message success">>),
-                <<"404">> => error_schema(<<"Message ID not found">>, [?MESSAGE_ID_NOT_FOUND])
+                <<"400">> => error_schema(<<"Message ID Schema error">>, [?MESSAGE_ID_SCHEMA_ERROR]),
+                <<"404">> => error_schema(<<"Message ID not found">>, [?MESSAGE_ID_NOT_FOUND]),
+                <<"200">> => object_schema(maps:without([payload], properties()), <<"Get delayed message success">>)
             }
         },
         delete => #{
             description => <<"Delete delayed message">>,
             parameters => parameters(),
             responses => #{
+                <<"400">> => error_schema(<<"Message ID Schema error">>, [?MESSAGE_ID_SCHEMA_ERROR]),
+                <<"404">> => error_schema(<<"Message ID not found">>, [?MESSAGE_ID_NOT_FOUND]),
                 <<"200">> => schema(<<"Delete delayed message success">>)
             }
         }
@@ -153,13 +157,21 @@ delayed_message(get, #{bindings := #{msgid := Id}}) ->
                 _ ->
                     {200, Message#{payload => base64:encode(Payload)}}
             end;
+        {error, id_schema_error} ->
+            {400, generate_http_code_map(id_schema_error, Id)};
         {error, not_found} ->
-            Message = iolist_to_binary(io_lib:format("Message ID ~p not found", [Id])),
-            {404, #{code => ?MESSAGE_ID_NOT_FOUND, message => Message}}
+            {404, generate_http_code_map(not_found, Id)}
     end;
 delayed_message(delete, #{bindings := #{msgid := Id}}) ->
-    _ = emqx_delayed:delete_delayed_message(Id),
-    {200}.
+    case emqx_delayed:get_delayed_message(Id) of
+        {ok, _Message} ->
+            _ = emqx_delayed:delete_delayed_message(Id),
+            {200};
+        {error, id_schema_error} ->
+            {400, generate_http_code_map(id_schema_error, Id)};
+        {error, not_found} ->
+            {404, generate_http_code_map(not_found, Id)}
+    end.
 
 %%--------------------------------------------------------------------
 %% internal function
@@ -220,6 +232,11 @@ update_config_(Node, Config) when Node =:= node() ->
 update_config_(Node, Config) ->
     rpc_call(Node, ?MODULE, ?FUNCTION_NAME, [Node, Config]).
 
+generate_http_code_map(id_schema_error, Id) ->
+    #{code => ?MESSAGE_ID_SCHEMA_ERROR, message => iolist_to_binary(io_lib:format("Message ID ~p schema error", [Id]))};
+generate_http_code_map(not_found, Id) ->
+    #{code => ?MESSAGE_ID_NOT_FOUND, message => iolist_to_binary(io_lib:format("Message ID ~p not found", [Id]))}.
+
 rpc_call(Node, Module, Fun, Args) ->
     case rpc:call(Node, Module, Fun, Args) of
         {badrpc, Reason} -> {error, Reason};