From 83c1ddda469e7a99f11afc7d6758b3d80ad9aa3b Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@python.org>
Date: Sun, 27 Apr 2014 10:33:58 -0700
Subject: [PATCH] asyncio: Be careful accessing instance variables in __del__
 (closes #21340).

---
 Lib/asyncio/tasks.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Lib/asyncio/tasks.py b/Lib/asyncio/tasks.py
index c6c22dd29f2..e8ee947501d 100644
--- a/Lib/asyncio/tasks.py
+++ b/Lib/asyncio/tasks.py
@@ -76,7 +76,9 @@ class CoroWrapper:
         return self.gen.gi_code
 
     def __del__(self):
-        frame = self.gen.gi_frame
+        # Be careful accessing self.gen.frame -- self.gen might not exist.
+        gen = getattr(self, 'gen', None)
+        frame = getattr(gen, 'gi_frame', None)
         if frame is not None and frame.f_lasti == -1:
             func = self.func
             code = func.__code__