Problem with reading guild bank content

[xTG]

Hello there,

i'm having issue with reading the guild bank content.
Sometimes it works... Sometimes not... And i don't understand why ! That's make me crazy...

I actually launch my code on two events.
EVENT_GUILD_BANK_SELECTED
This simply set a global variable to get the bankID.

function LGBE:selectGuildBank(eventCode, guildBankId)
	LGBEStack.guildBankId = guildBankId
	logActionToChat(string.format("Banque de guilde active : (%d) %s", LGBEStack.guildBankId, GetGuildName(LGBEStack.guildBankId)))
end

EVENT_GUILD_BANK_ITEMS_READY
Here is the main point.
In my trace i see the bankID is correct.
But it seems the GetItemName, GetItemType only return something the first time i launch this function...

function LGBE:update()
	if LGBEStack.debugInfo ~= false then
		logActionToChat("LGBE:update")
	end
	if LGBEStack.exporting ~= true then
		LGBEStack.debugInfo = true
		local bankSlots = GetBagSize(BAG_GUILDBANK)
		local nbItems = 0
		local nbNonStackedSlot = 0

		if LGBEStack.debugInfo ~= false then
			logActionToChat(string.format("bankSlots=(%d)", bankSlots))
		end
		logActionToChat("LegionGuildBankExtract : Extraction en cours...")
		logActionToChat(string.format("Banque de guilde active : (%d) %s", LGBEStack.guildBankId, GetGuildName(LGBEStack.guildBankId)))
		
		-- réinitialisation des variables sauvegardées
		savedVars['bank'] = {}
		
		--
		-- Boucler sur les slots de la banque
		--
		for bankSlot = 0, bankSlots do
			local bankItemName = GetItemName(BAG_GUILDBANK, bankSlot)
			local bankStack,bankMaxStack = GetSlotStackSize(BAG_GUILDBANK, bankSlot)
			local bankItemType = GetItemType(BAG_GUILDBANK, bankSlot)
			if bankSlot < 50 then
				logActionToChat(string.format("Slot %d %s %d %d %d", bankSlot, bankItemName, bankStack, bankMaxStack, bankItemType))
			end
			if bankItemName ~= "" then
				-- Slot non vide, on sauvegarde donc l'information
				local itemType = GetItemType(BAG_GUILDBANK, bankSlot)
				if isSavedItem[itemType + 1] ~= false then -- /!\ les types commencent à 0 mais les index d'array à 1
					if savedVars['bank'][bankItemName] ~= nil then
						-- L'objet a déjà été inséré via une autre pile, on remet juste à jour le nombre
						savedVars['bank'][bankItemName]['bankStack'] = savedVars['bank'][bankItemName]['bankStack'] + bankStack
						if LGBEStack.debugInfo ~= false then
							logActionToChat(string.format("Slot(%s) %s/%s %s additionnés", bankSlot, bankStack, bankMaxStack, bankItemName))
						end
						if bankStack < bankMaxStack and savedVars['bank'][bankItemName]['bankStack'] < bankMaxStack then
							nbNonStackedSlot = nbNonStackedSlot + 1
						end
					else
						local tmpArray = {}
						tmpArray['bankSlot'] = bankSlot
						tmpArray['bankStack'] = bankStack
						tmpArray['bankItemName'] = bankItemName
						savedVars['bank'][bankItemName] = tmpArray
						if LGBEStack.debugInfo ~= false then
							logActionToChat(string.format("Slot(%s) %s %s ajoutés", bankSlot, bankStack, bankItemName))
						end
					end
					nbItems = nbItems + 1
				end
			end
		end
		logActionToChat(string.format("LegionGuildBankExtract : Fin [%d objets extraits][%d piles séparées]", nbItems, nbNonStackedSlot))
		-- Mise a jour de la banque sauvegardée pour ne pas exécuter le script plusieurs fois
		if nbItems ~= 0 then
			LGBEStack.lastGuildBankIdExport = LGBEStack.guildBankId
		end
		LGBEStack.debugInfo = false
	else
		if LGBEStack.debugInfo ~= false then
			logActionToChat("Export deja en cours")
		end
	end
end

If i try to launch this function on the second or third guild bank it returns 0 items and i can see the 50 first slots empty. Which are not...

Anyone have a clue about this ? What i am doing wrong ?

Best Regards.