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-rw-r--r--lib/sqlalchemy/orm/mapper.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/sqlalchemy/orm/mapper.py b/lib/sqlalchemy/orm/mapper.py
index 7332e3104..d7b7fbb7c 100644
--- a/lib/sqlalchemy/orm/mapper.py
+++ b/lib/sqlalchemy/orm/mapper.py
@@ -1264,7 +1264,7 @@ class Mapper(object):
generated_cols.append(self.version_id_col)
for c in generated_cols:
- if c.key in params:
+ if c.key in params and c in self._columntoproperty:
self._set_state_attr_by_column(state, c, params[c.key])
deferred_props = [prop.key for prop in [self._columntoproperty[c] for c in postfetch_cols]]