diff --git a/framework/lualib-src/lua-ecs/luaecs.c b/framework/lualib-src/lua-ecs/luaecs.c
index 6f32c81..19356bc 100644
--- a/framework/lualib-src/lua-ecs/luaecs.c
+++ b/framework/lualib-src/lua-ecs/luaecs.c
@@ -162,6 +162,9 @@ add_component_id_(lua_State *L, int world_index, struct entity_world *w, int cid
 	}
 	++pool->n;
 	pool->id[index] = eid;
+	if (index > 0 && eid <= pool->id[index-1]) {
+		luaL_error(L, "Add component %d fail", cid);
+	}
 	return index;
 }
 
@@ -1119,7 +1122,7 @@ update_iter(lua_State *L, int world_index, int lua_index, struct group_iter *ite
 						luaL_error(L, "Missing lua table for %d", k->id);
 					}
 					lua_insert(L, -2);
-					lua_rawseti(L, -2, index);
+					lua_rawseti(L, -2, index + 1);
 				} else {
 					void *buffer = entity_add_sibling_(iter->world, mainkey, idx, k->id, NULL, L, world_index);
 					write_component_object(L, k->field_n, f, buffer);
diff --git a/framework/lualib-src/lua-ecs/test10.lua b/framework/lualib-src/lua-ecs/test10.lua
new file mode 100644
index 0000000..f6aa67a
--- /dev/null
+++ b/framework/lualib-src/lua-ecs/test10.lua
@@ -0,0 +1,39 @@
+local ecs = require "ecs"
+
+local w = ecs.world()
+
+w:register {
+	name = "key",
+	type = "int",
+}
+
+w:register {
+	name = "temp",
+	type = "lua",
+}
+
+for i = 1, 10 do
+  w:new { key = i }
+end
+
+local function add_temp(i)
+	for v in w:select "key:in temp?temp" do
+		if v.key == i then
+			v.temp = "Temp"
+		end
+	end
+end
+
+local function print_entity()
+	for v in w:select "key:in temp:in" do
+		print(v.key, v.temp)
+	end
+end
+
+add_temp(5)
+print_entity()
+
+add_temp(6)
+print_entity()
+
+assert(pcall(add_temp, 4) == false)
\ No newline at end of file