From 71d4920ac5c16f2ef37da88b3f563c25c585fb82 Mon Sep 17 00:00:00 2001
From: Andy Kipp <anki-code@users.noreply.github.com>
Date: Fri, 14 Feb 2025 22:39:10 +0600
Subject: [PATCH] Update pipelines.py: fix checking `self.proc` (#5794)

* Update pipelines.py

* Create pipelines_fix_check_self_proc.rst
---
 news/pipelines_fix_check_self_proc.rst | 23 +++++++++++++++++++++++
 xonsh/procs/pipelines.py               |  2 +-
 2 files changed, 24 insertions(+), 1 deletion(-)
 create mode 100644 news/pipelines_fix_check_self_proc.rst

diff --git a/news/pipelines_fix_check_self_proc.rst b/news/pipelines_fix_check_self_proc.rst
new file mode 100644
index 000000000..0d04d73d8
--- /dev/null
+++ b/news/pipelines_fix_check_self_proc.rst
@@ -0,0 +1,23 @@
+**Added:**
+
+* <news item>
+
+**Changed:**
+
+* <news item>
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* pipelines: fixed ``'NoneType' object has no attribute 'pid'`` exception (#5794).
+
+**Security:**
+
+* <news item>
diff --git a/xonsh/procs/pipelines.py b/xonsh/procs/pipelines.py
index fabcd0e57..9bb4d58d2 100644
--- a/xonsh/procs/pipelines.py
+++ b/xonsh/procs/pipelines.py
@@ -727,7 +727,7 @@ class CommandPipeline:
     @property
     def pid(self):
         """Process identifier."""
-        return self.proc.pid
+        return self.proc.pid if self.proc else None
 
     @property
     def returncode(self):