diff --git a/src/http_handler/network_handler.erl b/src/http_handler/network_handler.erl
index b3550e6..da04d2a 100644
--- a/src/http_handler/network_handler.erl
+++ b/src/http_handler/network_handler.erl
@@ -14,12 +14,13 @@
 -export([handle_request/4]).
 
 handle_request("POST", "/network/create", _, #{<<"id">> := NetworkId}) when NetworkId > 0 ->
-    case sdlan_network_sup:ensured_network_started(NetworkId) of
+    case sdlan_network_sup:ensure_network_started(NetworkId) of
         {ok, Pid} when is_pid(Pid) ->
             {ok, 200, sdlan_util:json_data(<<"success">>)};
         {error, Reason} ->
             logger:debug("[network_handler] create network: ~p, get error: ~p", [NetworkId, Reason]),
-            {ok, 200, sdlan_util:json_error(-1, <<"error">>)}
+            ReasonBin = sdlan_util:term_to_binary(Reason),
+            {ok, 200, sdlan_util:json_error(-1, <<"error: ", ReasonBin/binary>>)}
     end;
 
 handle_request("POST", "/network/delete", _, #{<<"id">> := NetworkId}) when NetworkId > 0 ->
diff --git a/src/sdlan_network.erl b/src/sdlan_network.erl
index e608daf..5b0e596 100644
--- a/src/sdlan_network.erl
+++ b/src/sdlan_network.erl
@@ -172,7 +172,7 @@ init([Id]) when is_integer(Id) ->
     erlang:process_flag(trap_exit, true),
     case sdlan_api:get_network(Id) of
         {ok, #{<<"ipaddr">> := Null}} when Null == <<"null">>; Null == <<"NULL">> ->
-            ignore;
+            {stop, <<"ipaddrr is null">>};
         {ok, NetworkInfo = #{<<"id">> := Id, <<"name">> := Name, <<"domain">> := Domain, <<"algorithm">> := Algorithm0, <<"ipaddr">> := IpAddr0, <<"owner_id">> := OwnerId}} ->
             logger:debug("[sdlan_network] load network info: ~p", [NetworkInfo]),
             {IpAddr, MaskLen} = parse_ipaddr(IpAddr0),
@@ -194,7 +194,7 @@ init([Id]) when is_integer(Id) ->
                 owner_id = OwnerId, mask_len = MaskLen, key = Key, throttle_key = ThrottleKey}};
         {error, Reason} ->
             logger:warning("[sdlan_network] load network: ~p, get error: ~p", [Id, Reason]),
-            ignore
+            {stop, Reason}
     end.
 
 %% @private
diff --git a/src/sdlan_network_sup.erl b/src/sdlan_network_sup.erl
index 5948464..069cd36 100644
--- a/src/sdlan_network_sup.erl
+++ b/src/sdlan_network_sup.erl
@@ -13,7 +13,7 @@
 
 %% API
 -export([start_link/0]).
--export([ensured_network_started/1, delete_network/1, get_all_networks/0, start_network/1, reallocate_bind_width/0]).
+-export([ensure_network_started/1, delete_network/1, get_all_networks/0, start_network/1, reallocate_bind_width/0]).
 
 %% Supervisor callbacks
 -export([init/1]).
@@ -50,13 +50,15 @@ init([]) ->
 %%% Internal functions
 %%%===================================================================
 
--spec ensured_network_started(Id :: integer()) -> {ok, Pid :: pid()} | {error, Reason :: any()}.
-ensured_network_started(Id) when is_integer(Id) ->
+-spec ensure_network_started(Id :: integer()) -> {ok, Pid :: pid()} | {error, Reason :: any()}.
+ensure_network_started(Id) when is_integer(Id) ->
     case sdlan_network:get_pid(Id) of
         undefined ->
             case supervisor:start_child(?MODULE, child_spec(Id)) of
                 {ok, Pid} when is_pid(Pid) ->
                     {ok, Pid};
+                {ok, undefined} ->
+                    {error, ignored};
                 {error, {'already_started', Pid}} when is_pid(Pid) ->
                     {ok, Pid};
                 {error, Error} ->
diff --git a/src/sdlan_util.erl b/src/sdlan_util.erl
index b502bc9..52dcf39 100644
--- a/src/sdlan_util.erl
+++ b/src/sdlan_util.erl
@@ -15,7 +15,7 @@
 -export([is_broadcast_mac/1, is_multicast_mac/1]).
 -export([ipv4_to_int/1, int_to_ipv4/1, ips/2, format_ip/1]).
 -export([ipv6_to_bytes/1, ipv6_bytes_to_binary/1, ipv6_assist_info/0]).
--export([hmac/2]).
+-export([hmac/2, term_to_binary/1]).
 
 -spec format_mac(Mac :: binary()) -> binary().
 format_mac(Mac) when is_binary(Mac) ->
@@ -162,3 +162,6 @@ hmac(Key, Data) when is_binary(Key), is_binary(Data) ->
     Digest = crypto:mac(hmac, md5, Key, Data),
     %% 转成十六进制小写字符串，和 PHP hash_hmac 一致
     lists:flatten([io_lib:format("~2.16.0b", [B]) || B <- binary:bin_to_list(Digest)]).
+
+term_to_binary(Term) ->
+    iolist_to_binary(io_lib:format("~p", [Term])).
\ No newline at end of file