From 96d27f191bf31e76fca8c4294a3238519d13a631 Mon Sep 17 00:00:00 2001
From: fourpoints <30053843+fourpoints@users.noreply.github.com>
Date: Wed, 25 May 2022 20:58:04 +0200
Subject: [PATCH] Add None check to PrettifyTreeprocessor

Fixes #1261.
---
 docs/change_log/release-3.4.md | 1 +
 markdown/treeprocessors.py     | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/docs/change_log/release-3.4.md b/docs/change_log/release-3.4.md
index eb36b409b..b38831cbf 100644
--- a/docs/change_log/release-3.4.md
+++ b/docs/change_log/release-3.4.md
@@ -68,3 +68,4 @@ The following new features have been included in the 3.4 release:
 The following bug fixes are included in the 3.4 release:
 
 * Extension entry-points are only loaded if needed (#1216).
+* Added a `None` check to `PrettifyTreeprocessor` (#1261).
diff --git a/markdown/treeprocessors.py b/markdown/treeprocessors.py
index a475fdeb4..f634ff53c 100644
--- a/markdown/treeprocessors.py
+++ b/markdown/treeprocessors.py
@@ -432,5 +432,5 @@ def run(self, root):
         # Clean up extra empty lines at end of code blocks.
         pres = root.iter('pre')
         for pre in pres:
-            if len(pre) and pre[0].tag == 'code':
+            if len(pre) and pre[0].tag == 'code' and pre[0].text is not None:
                 pre[0].text = util.AtomicString(pre[0].text.rstrip() + '\n')