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-rw-r--r--lib/sqlalchemy/orm/session.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/sqlalchemy/orm/session.py b/lib/sqlalchemy/orm/session.py
index 0c3bc5cbe..d6fc5baea 100644
--- a/lib/sqlalchemy/orm/session.py
+++ b/lib/sqlalchemy/orm/session.py
@@ -2291,7 +2291,8 @@ class sessionmaker(_SessionClassMethods):
kw['autoflush'] = autoflush
kw['autocommit'] = autocommit
kw['expire_on_commit'] = expire_on_commit
- kw['info'] = info
+ if info is not None:
+ kw['info'] = info
self.kw = kw
# make our own subclass of the given class, so that
# events can be associated with it specifically.