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-rw-r--r--Lib/subprocess.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index afa92a504c..5438f158cb 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -618,7 +618,7 @@ class Popen(object):
return
# In case the child hasn't been waited on, check if it's done.
self.poll(_deadstate=sys.maxint)
- if self.returncode is None:
+ if self.returncode is None and _active is not None:
# Child is still running, keep us alive until we can wait on it.
_active.append(self)