diff --git a/lualib-src/lua-bson.c b/lualib-src/lua-bson.c
index 76daef40..eacecf3c 100644
--- a/lualib-src/lua-bson.c
+++ b/lualib-src/lua-bson.c
@@ -415,6 +415,8 @@ append_one(struct bson *bs, lua_State *L, const char *key, size_t sz, int depth)
 		append_key(bs, L, BSON_BOOLEAN, key, sz);
 		write_byte(bs, lua_toboolean(L,-1));
 		break;
+	case LUA_TNIL:
+		luaL_error(L, "Bson array has a hole (nil), Use bson.null instead");
 	default:
 		luaL_error(L, "Invalid value type : %s", lua_typename(L,vt));
 	}
@@ -452,12 +454,7 @@ pack_dict_data(lua_State *L, struct bson *b, int depth, int kt) {
 	size_t sz;
 	switch(kt) {
 	case LUA_TNUMBER:
-		// copy key, don't change key type
-		lua_pushvalue(L,-2);
-		lua_insert(L,-2);
-		key = lua_tolstring(L,-2,&sz);
-		append_one(b, L, key, sz, depth);
-		lua_pop(L,2);
+		luaL_error(L, "Bson dictionary's key can't be number");
 		break;
 	case LUA_TSTRING:
 		key = lua_tolstring(L,-2,&sz);
diff --git a/lualib/skynet/db/redis/cluster.lua b/lualib/skynet/db/redis/cluster.lua
index 99e37577..9c83a929 100644
--- a/lualib/skynet/db/redis/cluster.lua
+++ b/lualib/skynet/db/redis/cluster.lua
@@ -33,7 +33,7 @@ function _M.new(startup_nodes,opt)
 end
 
 local function nodename(node)
-	return string.format("%s:%s",node.host,node.port)
+	return string.format("%s:%d",node.host,node.port)
 end
 
 function rediscluster:get_redis_link(node)
@@ -74,20 +74,22 @@ function rediscluster:initialize_slots_cache()
 			local conn = self.connections[name] or self:get_redis_link(startup_node)
 			local list = conn:cluster("slots")
 			for _,result in ipairs(list) do
-				local ip,port,runid = table.unpack(result[3])
+				local ip,port = table.unpack(result[3])
+				assert(ip)
+				port = assert(tonumber(port))
 				local master_node = {
 					host = ip,
 					port = port,
-					runid = runid,
 					slaves = {},
 				}
 				self:set_node_name(master_node)
 				for i=4,#result do
-					local ip,port,runid = table.unpack(result[i])
+					local ip,port = table.unpack(result[i])
+					assert(ip)
+					port = assert(tonumber(port))
 					local slave_node = {
 						host = ip,
 						port = port,
-						runid = runid,
 					}
 					self:set_node_name(slave_node)
 					table.insert(master_node.slaves,slave_node)
@@ -184,10 +186,7 @@ function rediscluster:close_all_connection()
 end
 
 function rediscluster:get_connection(node)
-	if type(node) == "string" then
-		local ip,port = string.match(node,"^([^:]+):([^:]+)$")
-		node = {host=ip,port=port}
-	end
+	node.port = assert(tonumber(node.port))
 	local name = node.name or nodename(node)
 	local conn = self.connections[name]
 	if not conn then
@@ -346,9 +345,10 @@ function rediscluster:call(...)
 					end
 					local newslot = tonumber(errlist[2])
 					local node_ip,node_port = string.match(errlist[3],"^([^:]+):([^:]+)$")
+					node_port = assert(tonumber(node_port))
 					local node = {
 						host = node_ip,
-						port = tonumber(node_port),
+						port = node_port,
 					}
 					if not asking then
 						self:set_node_name(node)
diff --git a/skynet-src/socket_server.c b/skynet-src/socket_server.c
index 5d4989e9..5546422d 100644
--- a/skynet-src/socket_server.c
+++ b/skynet-src/socket_server.c
@@ -1389,14 +1389,16 @@ socket_server_poll(struct socket_server *ss, struct socket_message * result, int
 				int error;
 				socklen_t len = sizeof(error);  
 				int code = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, &error, &len);  
+				const char * err = NULL;
 				if (code < 0) {
-					result->data = strerror(errno);
+					err = strerror(errno);
 				} else if (error != 0) {
-					result->data = strerror(error);
+					err = strerror(error);
 				} else {
-					result->data = "Unknown error";
+					err = "Unknown error";
 				}
 				force_close(ss, s, &l, result);
+				result->data = (char *)err;
 				return SOCKET_ERR;
 			}
 			break;
diff --git a/test/testbson.lua b/test/testbson.lua
index 815ffdef..214d70cd 100644
--- a/test/testbson.lua
+++ b/test/testbson.lua
@@ -22,9 +22,9 @@ end
 
 local obj_a = {
 	__data = {
-		[1] = 2,
-		[3] = 4,
-		[5] = 6,
+		["1"] = 2,
+		["3"] = 4,
+		["5"] = 6,
 	}
 }
 
@@ -38,9 +38,9 @@ setmetatable(
 
 local obj_b = {
 	__data = {
-		[7] = 8,
-		[9] = 10,
-		[11] = obj_a,
+		["7"] = 8,
+		["9"] = 10,
+		["11"] = obj_a,
 	}
 }