Queries :: Invalid Use Of Null

I have a query feeding a form. It displays Active Orders. So the SQL is:

Code:
SELECT Orders.[Order ID], Orders.[Employee ID], Orders.[Customer ID], Orders.[Order Date], Orders.[Shipped Date], [Order Price Totals].[Price Total] AS [Sub Total], Orders.[Shipping Fee], Orders.Taxes, [Sub Total]+[Shipping Fee]+[Taxes] AS [Order Total], Orders.[Ship Name], Orders.[Ship Address], Orders.[Paid Date], [Orders Status].[status name] AS Status
FROM [Orders Status] RIGHT JOIN (Orders LEFT JOIN [Order Price Totals] ON Orders.[Order ID] = [Order Price Totals].OrderID) ON [Orders Status].[Status ID] = Orders.[Status ID]
ORDER BY Orders.[Order ID] DESC;

It has worked for the past year. However today is gives me an Invalid Use of Null error and will not load.