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-rw-r--r--lib/sqlalchemy/orm/state.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/sqlalchemy/orm/state.py b/lib/sqlalchemy/orm/state.py
index 25e557eda..3e80b703f 100644
--- a/lib/sqlalchemy/orm/state.py
+++ b/lib/sqlalchemy/orm/state.py
@@ -289,7 +289,7 @@ class InstanceState(object):
instance_dict._modified.add(self)
self.modified = True
- if not self._strong_obj:
+ if self._strong_obj is None:
self._strong_obj = self.obj()
def commit(self, dict_, keys):