1 files changed, 2 insertions, 2 deletions
diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index 79dffd3..26a1e69 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -1983,9 +1983,9 @@ class Popen(object):
             with _PopenSelector() as selector:
                 if self.stdin and input:
                     selector.register(self.stdin, selectors.EVENT_WRITE)
-                if self.stdout:
+                if self.stdout and not self.stdout.closed:
                     selector.register(self.stdout, selectors.EVENT_READ)
-                if self.stderr:
+                if self.stderr and not self.stderr.closed:
                     selector.register(self.stderr, selectors.EVENT_READ)
 
                 while selector.get_map():