1 files changed, 4 insertions, 3 deletions
diff --git a/aconf/model/node.lua b/aconf/model/node.lua
index 49053f5..43f06e9 100644
--- a/aconf/model/node.lua
+++ b/aconf/model/node.lua
@@ -297,7 +297,7 @@ function M.List:init(context, params, dtype)
       if v == nil then
 	 local len = #mt.members()
 	 while k < len do
-	    mt.save(k, mt.load(k + 1, {dereference=false}))
+	    save(k, mt.load(k + 1, {dereference=false}))
 	    k = k + 1
 	 end
       end
@@ -305,10 +305,11 @@ function M.List:init(context, params, dtype)
    end
 
    function mt.insert(v, i)
+      assert(v ~= nil)
       local len = #mt.members()
       if not i then i = len + 1 end
-      for j = len,i,-1 do mt.save(j + 1, mt.load(j, {dereference=false})) end
-      mt.save(i, v)
+      for j = len,i,-1 do save(j + 1, mt.load(j, {dereference=false})) end
+      save(i, v)
    end
 end