From 98ad327864aed8df245fd19ea9d2743279e11643 Mon Sep 17 00:00:00 2001
From: Mariusz Felisiak <felisiak.mariusz@gmail.com>
Date: Tue, 29 Dec 2020 09:04:35 +0100
Subject: Fixed #32299 -- Prevented mutating handlers when processing
 middlewares marking as unused in an async context.

Thanks Hubert Bielenia for the report.
---
 docs/releases/3.1.5.txt | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'docs')

diff --git a/docs/releases/3.1.5.txt b/docs/releases/3.1.5.txt
index 0d11118446..eea060d112 100644
--- a/docs/releases/3.1.5.txt
+++ b/docs/releases/3.1.5.txt
@@ -12,3 +12,7 @@ Bugfixes
 * Fixed ``__isnull=True`` lookup on key transforms for
   :class:`~django.db.models.JSONField` with Oracle and SQLite
   (:ticket:`32252`).
+
+* Fixed a bug in Django 3.1 that caused a crash when processing middlewares in
+  an async context with a middleware that raises a ``MiddlewareNotUsed``
+  exception (:ticket:`32299`).
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