From 7788b12f8d236d21fe0c2364b971f8636ce5075d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20Gr=C3=B6nholm?= <alex.gronholm@nextday.fi>
Date: Wed, 2 Oct 2024 22:28:04 +0300
Subject: [PATCH] Fixed TypeError when TLS handshake fails with truststore
 SSLContext

Fixes #795.
---
 src/anyio/streams/tls.py | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/anyio/streams/tls.py b/src/anyio/streams/tls.py
index 83240b4d..b6961bee 100644
--- a/src/anyio/streams/tls.py
+++ b/src/anyio/streams/tls.py
@@ -162,9 +162,8 @@ async def _call_sslobject_method(
             except ssl.SSLError as exc:
                 self._read_bio.write_eof()
                 self._write_bio.write_eof()
-                if (
-                    isinstance(exc, ssl.SSLEOFError)
-                    or "UNEXPECTED_EOF_WHILE_READING" in exc.strerror
+                if isinstance(exc, ssl.SSLEOFError) or (
+                    exc.strerror and "UNEXPECTED_EOF_WHILE_READING" in exc.strerror
                 ):
                     if self.standard_compatible:
                         raise BrokenResourceError from exc