diff --git a/stead/object.lua b/stead/object.lua
index 4e7ba24..103ca82 100644
--- a/stead/object.lua
+++ b/stead/object.lua
@@ -135,7 +135,7 @@ function list_check(self, name) -- force using of objects, instead refs
 	for i,v,ii in opairs(self) do
 		local o = stead.ref(v);
 		if not isObject(o) then 
-			error ("No object: "..tostring(v))
+			error ("No object: "..name.."["..tostring(ii).."]".." ("..tostring(type(v))..")")
 			return false
 		end
 		if (v.auto_allocated and not stead.ref(v.key_name)) -- renew
diff --git a/stead/stead.lua b/stead/stead.lua
index a953504..889a496 100644
--- a/stead/stead.lua
+++ b/stead/stead.lua
@@ -581,7 +581,7 @@ function list_check(self, name)
 	for i,v,ii in opairs(self) do
 		local o = stead.ref(v);
 		if not o then -- isObject(o) then -- compat
-			error ("No object: "..tostring(v))
+			error ("No object: "..name.."["..tostring(ii).."]".." ("..tostring(type(v))..")")
 			return false
 		end
 		if stead.deref(v) then