[BUG] getFuturesHolding: ошибка в работе

if self.session_status ~= 'основная сессия' then
        Log:trace('Актуальный статус торговой сессии getFuturesHolding: ' .. holdings.session_status .. ' ' .. self.session_status)
        end

local MoneyManagement = {}
MoneyManagement.__index = MoneyManagement

function MoneyManagement:new()
    local self = setmetatable({}, WindowCoordinates)
    
-- поставить свои данные

    self.firmid = ''
    self.account = ''
    self.type = 0

    return self
end

-- Function to get Futures Holding
function MoneyManagement:FuturesHolding(symbol)
    local holdings = getFuturesHolding(self.firmid, self.account, symbol, self.type)
    if holdings then
        self.holdings = holdings
        self.startbuy = holdings.startbuy or 0
        self.startsell = holdings.startsell or 0
        self.startnet = holdings.startnet or 0
        self.todaybuy = holdings.todaybuy or 0
        self.todaysell = holdings.todaysell or 0
        self.totalnet = holdings.totalnet or 0
        self.openbuys = holdings.openbuys or 0
        self.opensells = holdings.opensells or 0
        self.lused = holdings.cbplused or 0
        self.lplanned = holdings.cbplplanned or 0
        self.varmargin = holdings.varmargin or 0
        self.avrposnprice = holdings.avrposnprice or 0
        self.positionvalue = holdings.positionvalue or 0
        self.real_varmargin = holdings.real_varmargin or 0
        self.total_varmargin = holdings.total_varmargin or 0

        --self.session_status = math.floor(holdings.session_status) or 0
        local session_status = {
            [0] = 'не определено',
            [1] = 'основная сессия',
            [2] = 'начался промклиринг',
            [3] = 'завершился промклиринг',
            [4] = 'начался основной клиринг',
            [5] = 'основной клиринг: новая сессия назначена',
            [6] = 'завершился основной клиринг',
            [7] = 'завершилась вечерняя сессия'
        }
        self.session_status = session_status[ math.floor(holdings.session_status)]
        if getFuturesHolding ~= 'основная сессия' then
        Log:trace('Актуальный статус торговой сессии getFuturesHolding: ' .. holdings.session_status .. ' ' .. self.session_status)
        end
    else
        Log:info("Ошибка функции getFuturesHolding, возвращает = " .. tostring(holdings) ..
                     "; self.firmid = " .. tostring(self.firmid) ..
                     "; self.account = " .. tostring(self.account) ..
                     "; symbol = " .. tostring(symbol) ..
                     "; self.type = " .. tostring(self.type)..' '.. type(self.type))
    end
end

    local working = nil
   
function OnStop(stop_flag)
  message(' OnStop: '..'stop_flag = '..tostring(stop_flag) )
  working = false
end

--[[ MAIN LOOP ]]--
function main()

    local symbol_names = {
                     'NGU4' 
                  , 'BRQ4' 
                        , 'GDU4'
                   ,
                        }
    working = true
   message("Robot started")
    local mm = MoneyManagement:new()
   
    while working do
   
       for _, symbol in ipairs(symbol_names) do
          mm:FuturesHolding(symbol)
      end
      
   end
end

local MoneyManagement = {}
MoneyManagement.__index = MoneyManagement

function MoneyManagement:new(firmid, account )
    local self = setmetatable({}, MoneyManagement)
    
    self.firmid = firmid
    self.account = account
    self.type = 0
    self.holdings = {}

    return self
end

-- Function to get Futures Holding
function MoneyManagement:FuturesHolding(symbol)
    local holdings = nil --getFuturesHolding(self.firmid, self.account, symbol, self.type) 
    if holdings then
        
   self.holdings = holdings
        self.startbuy = holdings.startbuy or 0
        self.startsell = holdings.startsell or 0
        self.startnet = holdings.startnet or 0
        self.todaybuy = holdings.todaybuy or 0
        self.todaysell = holdings.todaysell or 0
        self.totalnet = holdings.totalnet or 0
        self.openbuys = holdings.openbuys or 0
        self.opensells = holdings.opensells or 0
        self.lused = holdings.cbplused or 0
        self.lplanned = holdings.cbplplanned or 0
        self.varmargin = holdings.varmargin or 0
        self.avrposnprice = holdings.avrposnprice or 0
        self.positionvalue = holdings.positionvalue or 0
        self.real_varmargin = holdings.real_varmargin or 0
        self.total_varmargin = holdings.total_varmargin or 0

        
        local session_status = {
            [0] = 'не определено',
            [1] = 'основная сессия',
            [2] = 'начался промклиринг',
            [3] = 'завершился промклиринг',
            [4] = 'начался основной клиринг',
            [5] = 'основной клиринг: новая сессия назначена',
            [6] = 'завершился основной клиринг',
            [7] = 'завершилась вечерняя сессия'
        }
        self.session_status = session_status[ math.floor(holdings.session_status)]
        if self.session_status ~= 'основная сессия' then
            message('Актуальный статус торговой сессии getFuturesHolding: ' .. holdings.session_status .. ' ' .. self.session_status)
        end
      
    else
        message("Ошибка функции getFuturesHolding, возвращает = " .. tostring(holdings) ..
                     "; self.firmid = " .. tostring(self.firmid) ..
                     "; self.account = " .. tostring(self.account) ..
                     "; symbol = " .. tostring(symbol) ..
                     "; self.type = " .. tostring(self.type)..' '.. type(self.type))
    end
end

    local working = nil
   
function OnStop(stop_flag)
  message(' OnStop: '..'stop_flag = '..tostring(stop_flag) )
  working = false
end

--[[ MAIN LOOP ]]--
function main()
    
   --local type = 0
   local firmid = ''
    local account = ''
   
    local symbol_names = {'NGU4' , 'BRQ4' , 'GDU4', 'NGU4' , 'NGX4' ,}
    working = true
   message("Robot started")
   
    local mm = MoneyManagement:new( firmid, account )-- , type
   
    while working do
   
       for _, symbol in ipairs(symbol_names) do
          mm:FuturesHolding(symbol)
      end
      
   end
end