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4 changes: 3 additions & 1 deletion pandas/core/reshape/merge.py
Original file line number Diff line number Diff line change
Expand Up @@ -2451,7 +2451,9 @@ def _convert_arrays_and_get_rizer_klass(
# expected type "Type[object]"
klass = _factorizers[lk.dtype.type] # type: ignore[index]
else:
klass = _factorizers[lk.dtype.type]
klass = libhashtable.ObjectFactorizer
lk = ensure_object(lk)
rk = ensure_object(rk)

else:
klass = libhashtable.ObjectFactorizer
Expand Down