diff --git a/graphql/introspection.lua b/graphql/introspection.lua
index 526138c..e88e3f4 100644
--- a/graphql/introspection.lua
+++ b/graphql/introspection.lua
@@ -230,7 +230,7 @@ __Type = types.object({
         kind = types.list(types.nonNull(__Type)),
         resolve = function(kind)
           if kind.__type == 'Object' then
-            return kind.interfaces
+            return kind.interfaces or {}
           end
         end
       },