diff --git a/lualib/mqueue.lua b/lualib/mqueue.lua
index 98a4b2bf..da7712af 100644
--- a/lualib/mqueue.lua
+++ b/lualib/mqueue.lua
@@ -34,9 +34,14 @@ local function message_dispatch(f)
 			local msg = table.remove(message_queue,1)
 			local session = msg.session
 			if session == 0 then
-				if do_func(f, msg) ~= nil then
-					skynet.fork(message_dispatch,f)
-					error(string.format("[:%x] send a message to [:%x] return something", msg.addr, skynet.self()))
+				local ok, msg = do_func(f, msg)
+				if ok then
+					if msg then
+						skynet.fork(message_dispatch,f)
+						error(string.format("[:%x] send a message to [:%x] return something", msg.addr, skynet.self()))
+					end
+				else
+					error(string.format("[:%x] send a message to [:%x] throw an error : %s", msg.addr, skynet.self(),msg))
 				end
 			else
 				local data, size = skynet.pack(do_func(f,msg))
diff --git a/service-src/service_lua.c b/service-src/service_lua.c
index bfb256a4..7339dbde 100644
--- a/service-src/service_lua.c
+++ b/service-src/service_lua.c
@@ -14,7 +14,8 @@
 #include <stdlib.h>
 #include <stdio.h>
 
-#define PREALLOCMEM (1024 * 1024)
+// define PREALLOCMEM to enable skynet defined alloc
+//#define PREALLOCMEM (1024 * 1024)
 
 // time
 
@@ -259,8 +260,8 @@ snlua_create(void) {
 
 void
 snlua_release(struct snlua *l) {
-	void * ud = NULL;
 #ifdef PREALLOCMEM
+	void * ud = NULL;
 	lua_Alloc lalloc = lua_getallocf(l->L, &ud);
 	assert(lalloc == skynet_lua_alloc);
 	lua_close(l->L);