Checking type on argument mailId failed in TakeMailAttachedItems_lua
stack traceback:
	[C]: in function 'TakeMailAttachedItems'
	user:/AddOns/Postmaster/Postmaster.lua:66: in function 'pProcessMailQueue'
	user:/AddOns/Postmaster/Postmaster.lua:103: in function 'pTakeAll'
	:1: in function '(main chunk)'

function pProcessMailQueue()
  local numMail = GetNumMailItems()
  local mailId = MAIL_INBOX:GetOpenMailId()
  
  local senderDisplayName, senderCharacterName, subject, 
        icon, unread, fromSystem, fromCustomerService, 
        returned, numAttachments, attachedMoney, codAmount, 
        expiresInDays, secsSinceReceived = GetMailItemInfo(mailId)
        
  if numMail == 0 then TakeAll = false return end -- no mail in inbox
  if mailId == nil then return end -- safety incase loop continues and there is no mail selected
  if TakeAll == false then return end -- flow control to ensure loop does not fire when player manually interacts with mail or uses the pTake function
  if subject == "" then subject = "(No Subject)" end

  if unread then RequestReadMail(mailId) end -- if mail is unread, read mail
  if numAttachments > 0 then TakeMailAttachedItems(mailId) end -- if mail has an attached item, take it
  if attachedMoney > 0 then TakeMailAttachedMoney(mailId) end -- if mail has money attached, take it
  DeleteMail(mailId, false) -- mail is read, has no items or money attached, delete it

end

Lines 96 to 105:
function pTakeAll()
  local numMail = GetNumMailItems()
  
  if numMail == 0 then 
    d(PM.funname..".TakeAll: There is no mail in your mailbox.")
  else
    TakeAll = true  -- TakeAll button pressed, allow pEventHandler to loop pProcessMailQueue
    pProcessMailQueue()
  end  
end