Set starting index of sets to 1.

diff --git a/MyCollection/Internals/Classes/Collection.lua b/MyCollection/Internals/Classes/Collection.lua
index b2603aa..2554861 100644
--- a/MyCollection/Internals/Classes/Collection.lua
+++ b/MyCollection/Internals/Classes/Collection.lua
@@ -49,7 +49,7 @@ function Collection:RemoveItem(item)
 end

 function Collection:AddSet(setId, armorType, orderNumber)
-    local newId = -1
+    local newId = 0
     if (next(self.sets) ~= nil) then
         for key, _ in pairs(self.sets) do
             if key > newId then