def check_seasonal_order(order):
    """Check the seasonal order

    Statsmodels 0.11.0 introduced a check for seasonal order == 1 that can
    raise a ValueError, but some of our old defaults allow for m == 1 in an
    otherwise null seasonal order.

    Parameters
    ----------
    order : tuple
        The existing seasonal order
    """
    if sum(order[:3]) == 0 and order[-1] == 1:
        order = (0, 0, 0, 0)

    # user's order may still be invalid, but we'll let statsmodels' validation
    # handle that.
    return order