From 0a4e755516892ab84b86956e7ae27058aa213ab8 Mon Sep 17 00:00:00 2001
From: Mouse Reeve <mousereeve@riseup.net>
Date: Mon, 29 Mar 2021 11:27:51 -0700
Subject: [PATCH] Fixes setting lower() on NoneType

---
 bookwyrm/views/books.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bookwyrm/views/books.py b/bookwyrm/views/books.py
index 8434cec0..02cbd1e2 100644
--- a/bookwyrm/views/books.py
+++ b/bookwyrm/views/books.py
@@ -266,7 +266,7 @@ class Editions(View):
             "editions": editions.filter(**filters).all(),
             "work": work,
             "languages": languages,
-            "formats": set(e.physical_format.lower() for e in editions),
+            "formats": set(e.physical_format.lower() for e in editions if e),
         }
         return TemplateResponse(request, "book/editions.html", data)