Internal Service Error When Submitting Quote

Hello —

Great Plugin! However, when I went to test submitting the quote — it comes back with an error saying ‘Internal Server Error’.

I also then tested by adding products that still had pricing on them and removed that ones that were just for quotes — but that went through just fine.

Only have the issue when going through the checkout process for items that are just meant to be quoted.

Here is a link to a product that is just to be quoted: http://www.motordolly.com/product/towable-chair-stacker-carts/

Please advise.

Thanks!