diff --git a/morituri/common/program.py b/morituri/common/program.py
index 5de9d14..58329c0 100644
--- a/morituri/common/program.py
+++ b/morituri/common/program.py
@@ -462,7 +462,8 @@ class Program:
         tags['TRACKNUMBER'] = u'%s' % number
 
         if self.metadata:
-            tags['DATE'] = self.metadata.release
+            if self.metadata.release is not None:
+                tags['DATE'] = self.metadata.release
 
             if number > 0:
                 tags['MUSICBRAINZ_TRACKID'] = mbidTrack