From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Sat, 27 Jul 2013 22:41:34 +0000 (-0400)
Subject: - this collection can be None on cleanup, so check for that
X-Git-Tag: rel_0_9_0b1~161
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=effad0a4e33d40940ca669f4f88c7cb9961db4da;p=thirdparty%2Fsqlalchemy%2Fsqlalchemy.git

- this collection can be None on cleanup, so check for that
---

diff --git a/lib/sqlalchemy/event/registry.py b/lib/sqlalchemy/event/registry.py
index af07493f4a..330650e562 100644
--- a/lib/sqlalchemy/event/registry.py
+++ b/lib/sqlalchemy/event/registry.py
@@ -41,7 +41,7 @@ ref(listenercollection) -> {
 
 def _collection_gced(ref):
     # defaultdict, so can't get a KeyError
-    if ref not in _collection_to_key:
+    if not _collection_to_key or ref not in _collection_to_key:
         return
     listener_to_key = _collection_to_key.pop(ref)
     for key in listener_to_key.values():