Help with savedVars and movable frames

[Zierk]

I've tried finding the solution to my issue using these threads already:
http://www.esoui.com/forums/showthread.php?t=1173
http://wiki.esoui.com/AddOn_Quick_Questions

Basically I am trying to save a movable frame's location across logouts and reloaduis using a saved variables file.

My code looks like this:

In MyAddon.txt

## SavedVariables: Postmaster_SavedVariables

-- save frame location after moving
function pOnMoveStop()
  local name = Postmaster:GetName()
  local left = Postmaster:GetLeft()
  local top = Postmaster:GetTop()
  
  if name == "" or name == nil then return end --debug line
  d("Position of "..name.." frame saved to "..left.."X, "..top.."Y.") --debug line
  savedVars.frameX = left
  savedVars.frameY = top
 
end
 
-- init default values
local defaults = 
{
  frameX = 100,
  frameY = 200,
}
 
-- Initalizing the addon
local function pInitialize( eventCode, addOnName )
  
  if ( addOnName ~= "Postmaster" ) then return end
  
 
  -- Get savedVars or set defaults
  savedVars = ZO_SavedVars:NewAccountWide("Postmaster_SavedVariables", Postmaster.version, nil, defaults)
  
  --Postmaster:ClearAnchors()
  Postmaster:SetAnchor(TOPLEFT, GuiRoot, TOPLEFT, savedVars.frameX, savedVars.frameY)
end

The issue, is that the default values will overwrite the saved values from the OnMoveStop function when I reloadui. I do not know how to initialize the saved Vars file without including the default values to avoid having a nil value error.