diff --git a/graphene_django/rest_framework/types.py b/graphene_django/rest_framework/types.py
index 956dc43..4c84c69 100644
--- a/graphene_django/rest_framework/types.py
+++ b/graphene_django/rest_framework/types.py
@@ -3,8 +3,8 @@ from graphene.types.unmountedtype import UnmountedType
 
 
 class ErrorType(graphene.ObjectType):
-    field = graphene.String()
-    messages = graphene.List(graphene.String)
+    field = graphene.String(required=True)
+    messages = graphene.List(graphene.NonNull(graphene.String), required=True)
 
 
 class DictType(UnmountedType):