From 8c50c27766a2cf5971ec66c3ecec3547b0632abf Mon Sep 17 00:00:00 2001
From: Omkommersind <chauzov@list.ru>
Date: Tue, 1 Dec 2020 22:06:53 +0300
Subject: [PATCH] Fixes 'NoneType' object has no attribute '_css_lists' error
 if extra_media parameter is None

---
 nested_inline/admin.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/nested_inline/admin.py b/nested_inline/admin.py
index a1906f5..48432e0 100644
--- a/nested_inline/admin.py
+++ b/nested_inline/admin.py
@@ -99,6 +99,8 @@ def wrap_nested_inline_formsets(self, request, inline, formset):
         media = None
 
         def get_media(extra_media):
+            if extra_media is None:
+                return ''
             if media:
                 return media + extra_media
             else: