From f0a63d55c4e455cce7f8ac02b1d05a9787f1922b Mon Sep 17 00:00:00 2001
From: "claude[bot]" <41898282+claude[bot]@users.noreply.github.com>
Date: Wed, 27 May 2026 20:24:35 +0000
Subject: [PATCH] Fix crash in Django admin when ScheduleItem has None speakers

Filter out None values from the speakers property to prevent
AttributeError when the admin's speakers_names method calls
display_name on invalid speaker objects.

Fixes #4657

Co-authored-by: Marco Acierno <marcoacierno@users.noreply.github.com>
---
 backend/schedule/models.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/backend/schedule/models.py b/backend/schedule/models.py
index 9e1716be26..b6326d76f7 100644
--- a/backend/schedule/models.py
+++ b/backend/schedule/models.py
@@ -347,7 +347,7 @@ def speakers(self):
         speakers.extend(
             [speaker.user for speaker in self.additional_speakers.order_by("id").all()]
         )
-        return speakers
+        return [speaker for speaker in speakers if speaker is not None]
 
     def clean(self):
         if self.type == ScheduleItem.TYPES.submission and not self.submission: