From f1e948d8b6787f1b0a01cfcd193325c414212878 Mon Sep 17 00:00:00 2001
From: matijakolaric <matijakolaric@users.noreply.github.com>
Date: Thu, 19 Dec 2019 22:26:37 +0100
Subject: [PATCH] Flag field bugfix

---
 music_metadata/edi/fields.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/music_metadata/edi/fields.py b/music_metadata/edi/fields.py
index ac598eb..1f57ab4 100644
--- a/music_metadata/edi/fields.py
+++ b/music_metadata/edi/fields.py
@@ -179,7 +179,7 @@ def __init__(self, *args, **kwargs):
     def __set__(self, instance, value):
         if self._mandatory and value == 'U':
             # Unknown resolves to None, so super() makes no sense
-            self._valuedict[instance] = None
+            instance.__dict__[self._name] = None
             return
         value = dict(
             (('Y', True), ('N', False), ('U', None), (' ', None))).get(value,