From 4498e97b462688bac2ff3615ac1da1b867b21842 Mon Sep 17 00:00:00 2001
From: Dmitry Shachnev <mitya57@users.noreply.github.com>
Date: Mon, 30 Oct 2023 21:41:11 +0300
Subject: [PATCH] Fix AttributeError when one of `css_files` is a string
 (#1537)

Fix AttributeError when one of css_files is a string
---
 sphinx_rtd_theme/layout.html | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/sphinx_rtd_theme/layout.html b/sphinx_rtd_theme/layout.html
index bf2c52733..c8a307628 100644
--- a/sphinx_rtd_theme/layout.html
+++ b/sphinx_rtd_theme/layout.html
@@ -29,7 +29,11 @@
     <link rel="stylesheet" href="{{ pathto('_static/pygments.css', 1) }}" type="text/css" />
   {%- endif %}
   {%- for css_file in css_files %}
-    {{ css_tag(css_file) }}
+    {%- if css_file|attr("filename") %}
+      {{ css_tag(css_file) }}
+    {%- else %}
+      <link rel="stylesheet" href="{{ pathto(css_file, 1)|escape }}" type="text/css" />
+    {%- endif %}
   {%- endfor %}
 
   {# "extra_css_files" is a theme option and it's always a string #}