[sirinsidiator]

You should simply wait for the EVENT_ADD_ON_LOADED before doing anything. When that fires, you can be certain that the saved vars have been loaded.

-- Here MyAddOnSavedVar is nil and if you assign any value it will be overwritten later
 
EVENT_MANAGER:RegisterForEvent("MyAddOnEventNamespace",  EVENT_ADD_ON_LOADED, function(_, addOnName)
    if addOnName == "MyAddOn" then
        EVENT_MANAGER:UnregisterForEvent("MyAddOnEventNamespace", EVENT_ADD_ON_LOADED)
        -- Here MyAddOnSavedVar is either nil if it didn't exist, or the previously stored value
    end
end)