diff --git a/CHANGES-4.3.md b/CHANGES-4.3.md
index 648086ec4..7f6d2b5a3 100644
--- a/CHANGES-4.3.md
+++ b/CHANGES-4.3.md
@@ -36,6 +36,7 @@ File format:
 * Fix Stomp client can not trigger `$event/client_connection` message [#7096]
 * Fix system memory false alarm at boot
 * Fix the MQTT-SN message replay when the topic is not registered to the client [#6970]
+* Fix rpc get node info maybe crash when other nodes is not ready.
 
 ## v4.3.12
 ### Important changes
diff --git a/src/emqx.appup.src b/src/emqx.appup.src
index dc045e08a..14ef02f80 100644
--- a/src/emqx.appup.src
+++ b/src/emqx.appup.src
@@ -1,8 +1,10 @@
 %% -*- mode: erlang -*-
 {VSN,
-  [{"4.3.13",
-    [{load_module,emqx_sys_mon,brutal_purge,soft_purge,[]},
-     {load_module,emqx_connection,brutal_purge,soft_purge,[]},
+  [
+    {"4.3.13",
+    [{load_module,emqx_connection,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys_mon,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_banned,brutal_purge,soft_purge,[]},
      {load_module,emqx_ctl,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
@@ -10,8 +12,9 @@
      {load_module,emqx_cm,brutal_purge,soft_purge,[]},
      {load_module,emqx_channel,brutal_purge,soft_purge,[]}]},
    {"4.3.12",
-    [{load_module,emqx_sys_mon,brutal_purge,soft_purge,[]},
-     {load_module,emqx_connection,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_connection,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys_mon,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_banned,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
@@ -30,6 +33,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.11",
     [{load_module,emqx_banned,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_ctl,brutal_purge,soft_purge,[]},
@@ -52,6 +56,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.10",
     [{load_module,emqx_banned,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_ctl,brutal_purge,soft_purge,[]},
@@ -74,6 +79,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.9",
     [{load_module,emqx_banned,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_ctl,brutal_purge,soft_purge,[]},
@@ -100,6 +106,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.8",
     [{load_module,emqx_banned,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_ctl,brutal_purge,soft_purge,[]},
@@ -126,6 +133,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.7",
     [{load_module,emqx_banned,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_ctl,brutal_purge,soft_purge,[]},
@@ -154,6 +162,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.6",
     [{load_module,emqx_pmon,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_banned,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_metrics,brutal_purge,soft_purge,[]},
@@ -182,6 +191,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.5",
     [{load_module,emqx_banned,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_metrics,brutal_purge,soft_purge,[]},
@@ -211,6 +221,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.4",
     [{load_module,emqx_banned,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_metrics,brutal_purge,soft_purge,[]},
@@ -241,6 +252,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.3",
     [{load_module,emqx_banned,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_metrics,brutal_purge,soft_purge,[]},
@@ -272,6 +284,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.2",
     [{load_module,emqx_banned,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_metrics,brutal_purge,soft_purge,[]},
@@ -303,6 +316,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.1",
     [{load_module,emqx_banned,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_metrics,brutal_purge,soft_purge,[]},
@@ -338,6 +352,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.0",
     [{load_module,emqx_banned,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_metrics,brutal_purge,soft_purge,[]},
@@ -375,9 +390,11 @@
      {load_module,emqx_message,brutal_purge,soft_purge,[]},
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {<<".*">>,[]}],
-  [{"4.3.13",
-    [{load_module,emqx_sys_mon,brutal_purge,soft_purge,[]},
-     {load_module,emqx_connection,brutal_purge,soft_purge,[]},
+  [
+   {"4.3.13",
+    [{load_module,emqx_connection,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys_mon,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_banned,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_ctl,brutal_purge,soft_purge,[]},
@@ -385,8 +402,9 @@
      {load_module,emqx_os_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_channel,brutal_purge,soft_purge,[]}]},
    {"4.3.12",
-    [{load_module,emqx_sys_mon,brutal_purge,soft_purge,[]},
-     {load_module,emqx_connection,brutal_purge,soft_purge,[]},
+    [{load_module,emqx_connection,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys_mon,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_banned,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
@@ -404,6 +422,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.11",
     [{load_module,emqx_banned,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_ctl,brutal_purge,soft_purge,[]},
@@ -425,6 +444,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.10",
     [{load_module,emqx_banned,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_ctl,brutal_purge,soft_purge,[]},
@@ -446,6 +466,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.9",
     [{load_module,emqx_banned,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_ctl,brutal_purge,soft_purge,[]},
@@ -471,6 +492,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.8",
     [{load_module,emqx_banned,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_ctl,brutal_purge,soft_purge,[]},
@@ -496,6 +518,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.7",
     [{load_module,emqx_banned,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_ctl,brutal_purge,soft_purge,[]},
@@ -523,6 +546,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.6",
     [{load_module,emqx_banned,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm,brutal_purge,soft_purge,[]},
@@ -550,6 +574,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.5",
     [{load_module,emqx_banned,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm,brutal_purge,soft_purge,[]},
@@ -578,6 +603,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.4",
     [{load_module,emqx_banned,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm,brutal_purge,soft_purge,[]},
@@ -607,6 +633,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.3",
     [{load_module,emqx_banned,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm,brutal_purge,soft_purge,[]},
@@ -637,6 +664,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.2",
     [{load_module,emqx_banned,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm,brutal_purge,soft_purge,[]},
@@ -667,6 +695,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.1",
     [{load_module,emqx_banned,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm,brutal_purge,soft_purge,[]},
@@ -701,6 +730,7 @@
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {"4.3.0",
     [{load_module,emqx_banned,brutal_purge,soft_purge,[]},
+     {load_module,emqx_sys,brutal_purge,soft_purge,[]},
      {load_module,emqx_pmon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm_mon,brutal_purge,soft_purge,[]},
      {load_module,emqx_vm,brutal_purge,soft_purge,[]},
diff --git a/src/emqx_sys.erl b/src/emqx_sys.erl
index 2d816569d..c61272e64 100644
--- a/src/emqx_sys.erl
+++ b/src/emqx_sys.erl
@@ -94,7 +94,15 @@ sysdescr() -> emqx_app:get_description().
 %% @doc Get sys uptime
 -spec(uptime() -> string()).
 uptime() ->
-    gen_server:call(?SYS, uptime).
+    {TotalWallClock, _} = erlang:statistics(wall_clock),
+    uptime(TotalWallClock div 1000).
+
+uptime(Seconds) ->
+    {D, {H, M, S}} = calendar:seconds_to_daystime(Seconds),
+    L0 = [{D, " days"}, {H, " hours"}, {M, " minutes"}, {S, " seconds"}],
+    L1 = lists:dropwhile(fun({K, _}) ->  K =:= 0 end, L0),
+    L2 = lists:map(fun({Time, Unit}) -> [integer_to_list(Time), Unit] end, L1),
+    lists:flatten(lists:join(", ", L2)).
 
 %% @doc Get sys datetime
 -spec(datetime() -> string()).
@@ -137,9 +145,6 @@ heartbeat(State) ->
 tick(State) ->
     State#state{ticker = start_timer(sys_interval(), tick)}.
 
-handle_call(uptime, _From, State) ->
-    {reply, uptime(State), State};
-
 handle_call(Req, _From, State) ->
     ?LOG(error, "Unexpected call: ~p", [Req]),
     {reply, ignored, State}.
@@ -149,7 +154,7 @@ handle_cast(Msg, State) ->
     {noreply, State}.
 
 handle_info({timeout, TRef, heartbeat}, State = #state{heartbeat = TRef}) ->
-    publish_any(uptime, iolist_to_binary(uptime(State))),
+    publish_any(uptime, iolist_to_binary(uptime())),
     publish_any(datetime, iolist_to_binary(datetime())),
     {noreply, heartbeat(State)};
 
@@ -173,24 +178,6 @@ terminate(_Reason, #state{heartbeat = TRef1, ticker = TRef2}) ->
 %% Internal functions
 %%-----------------------------------------------------------------------------
 
-uptime(#state{start_time = Ts}) ->
-    Secs = timer:now_diff(erlang:timestamp(), Ts) div 1000000,
-    lists:flatten(uptime(seconds, Secs)).
-uptime(seconds, Secs) when Secs < 60 ->
-    [integer_to_list(Secs), " seconds"];
-uptime(seconds, Secs) ->
-    [uptime(minutes, Secs div 60), integer_to_list(Secs rem 60), " seconds"];
-uptime(minutes, M) when M < 60 ->
-    [integer_to_list(M), " minutes, "];
-uptime(minutes, M) ->
-    [uptime(hours, M div 60), integer_to_list(M rem 60), " minutes, "];
-uptime(hours, H) when H < 24 ->
-    [integer_to_list(H), " hours, "];
-uptime(hours, H) ->
-    [uptime(days, H div 24), integer_to_list(H rem 24), " hours, "];
-uptime(days, D) ->
-    [integer_to_list(D), " days, "].
-
 publish_any(Name, Value) ->
     _ = publish(Name, Value),
     ok.
diff --git a/test/emqx_sys_SUITE.erl b/test/emqx_sys_SUITE.erl
index 29583524f..e7289cb38 100644
--- a/test/emqx_sys_SUITE.erl
+++ b/test/emqx_sys_SUITE.erl
@@ -34,7 +34,7 @@ end_per_suite(_Config) ->
     application:unload(emqx),
     ok = emqx_logger:set_log_level(error),
     ok.
-    
+
 % t_version(_) ->
 %     error('TODO').
 
@@ -42,10 +42,23 @@ end_per_suite(_Config) ->
 %     error('TODO').
 
 t_uptime(_) ->
-    ?assertEqual(<<"1 seconds">>, iolist_to_binary(emqx_sys:uptime(seconds, 1))),
-    ?assertEqual(<<"1 minutes, 0 seconds">>, iolist_to_binary(emqx_sys:uptime(seconds, 60))),
-    ?assertEqual(<<"1 hours, 0 minutes, 0 seconds">>, iolist_to_binary(emqx_sys:uptime(seconds, 3600))),
-    ?assertEqual(<<"1 days, 0 hours, 0 minutes, 0 seconds">>, iolist_to_binary(emqx_sys:uptime(seconds, 86400))).
+    ?assert(is_list(emqx_sys:uptime())),
+    ?assertEqual(<<"1 seconds">>, iolist_to_binary(emqx_sys:uptime(1))),
+    ?assertEqual(<<"1 minutes, 0 seconds">>, iolist_to_binary(emqx_sys:uptime(60))),
+    ?assertEqual(<<"1 hours, 0 minutes, 0 seconds">>, iolist_to_binary(emqx_sys:uptime(3600))),
+    ?assertEqual(<<"1 hours, 1 minutes, 1 seconds">>, iolist_to_binary(emqx_sys:uptime(3661))),
+    ?assertEqual(<<"1 days, 0 hours, 0 minutes, 0 seconds">>, iolist_to_binary(emqx_sys:uptime(86400))),
+    lists:map(fun({D, H, M, S}) ->
+        Expect = <<
+            (integer_to_binary(D))/binary, " days, ",
+            (integer_to_binary(H))/binary, " hours, ",
+            (integer_to_binary(M))/binary, " minutes, ",
+            (integer_to_binary(S))/binary, " seconds"
+        >>,
+        Actual = iolist_to_binary(emqx_sys:uptime(D * 86400 + H * 3600 + M * 60 + S)),
+        ?assertEqual(Expect, Actual)
+              end,
+        [{1, 2, 3, 4}, {10, 20, 30, 40}, {2222, 3, 56, 59}, {59, 23, 59, 59}]).
 
 % t_datetime(_) ->
 %     error('TODO').