C++ Problem with getField

[kubernik]

Hello, i have problem with rewrite function from tfs 0.3.6 to tfs 1.3(downgraded to 8.6)

Function from 0.3.6:

int32_t LuaInterface::luaSendChannels(lua_State* L)
{
    ScriptEnviroment* env = getEnv();
    if(!lua_istable(L, -1))
    {
        errorEx("channel list is not a table.");
        lua_pushboolean(L, false);
        return 1;
    }

    std::string name;
    map16_string channels;
    lua_pushnil(L);
    while(lua_next(L, -2))
    {                           
        channels[(uint16_t)getField(L, "id")] = getFieldString(L, "name");
        lua_pop(L, 1);
    }
    lua_pop(L, 1);

    Player* player = env->getPlayerByUID((uint32_t)popNumber(L));
    if(!player)
    {
        errorEx(getError(LUA_ERROR_PLAYER_NOT_FOUND));
        lua_pushboolean(L, false);
    }

    player->sendChannels(channels);
    lua_pushboolean(L, true);
    return 1;
}

I wrote this code into this form:

int LuaScriptInterface::luaSendChannels(lua_State* L)
{
    //luaSendChannels(cid, {channels})
    if (!isTable(L, -1)) {
        reportErrorFunc("channel list is not a table.");
        lua_pushboolean(L, false);
        return 1;
    }
    std::string name;
    map16_string channels;
    lua_pushnil(L);
    while (lua_next(L, -2) != 0) { 
        channels[getField<uint16_t>(L, -2, "id")] = getFieldString(L, -1, "name");
        lua_pop(L, 1);
    }
    lua_pop(L, 1);

    Player* player = getUserdata<Player>(L, 1);
    if(!player) {
        reportErrorFunc(getErrorDesc(LUA_ERROR_PLAYER_NOT_FOUND));
        lua_pushboolean(L, false);
    }

    player->sendChannels(channels);
    lua_pushboolean(L, true);
    return 1;
}

in Lua i using this script:

function onStepIn(cid, item, pos)
    local channelsTbl = {}
    local tempTbl = {id = 1, name = "text"}
    table.insert(channelsTbl, tempTbl)
    cid:sendChannels(channelsTbl)
end

but i have error in console:

invalid key to 'next'

i think that problem is with getField, but i don't know how to use that..
I don't know how to make it work, someone can help me?