From 6313c98278b3add084c8ef2728754ced0cde30f6 Mon Sep 17 00:00:00 2001
From: "Egor.Eliseev" <egor.eliseev@jetbrains.com>
Date: Tue, 11 Jul 2023 17:37:27 +0300
Subject: [PATCH] GH-106584: Check buffers before seek

---
 Lib/unittest/result.py | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/Lib/unittest/result.py b/Lib/unittest/result.py
index 7757dba9670b43..bf206e6d875380 100644
--- a/Lib/unittest/result.py
+++ b/Lib/unittest/result.py
@@ -97,10 +97,12 @@ def _restoreStdout(self):
 
             sys.stdout = self._original_stdout
             sys.stderr = self._original_stderr
-            self._stdout_buffer.seek(0)
-            self._stdout_buffer.truncate()
-            self._stderr_buffer.seek(0)
-            self._stderr_buffer.truncate()
+            if self._stdout_buffer is not None:
+                self._stdout_buffer.seek(0)
+                self._stdout_buffer.truncate()
+            if self._stderr_buffer is not None:
+                self._stderr_buffer.seek(0)
+                self._stderr_buffer.truncate()
 
     def stopTestRun(self):
         """Called once after all tests are executed.