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-rw-r--r--lib/sqlalchemy/schema.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/sqlalchemy/schema.py b/lib/sqlalchemy/schema.py
index 9a49c785e..7323a5657 100644
--- a/lib/sqlalchemy/schema.py
+++ b/lib/sqlalchemy/schema.py
@@ -390,6 +390,7 @@ class Table(SchemaItem, expression.TableClause):
def _autoincrement_column(self):
for col in self.primary_key:
if col.autoincrement and \
+ col.type._type_affinity is not None and \
issubclass(col.type._type_affinity, sqltypes.Integer) and \
not col.foreign_keys and \
isinstance(col.default, (type(None), Sequence)) and \