Latest version, fresh install - 500 error when trying to save quotes

Just installed the latest version, everything went smooth and I can create everything, but I can’t save quotes. I’m also getting the spinning gear with the 500 error in the web inspector:

Failed to load resource: the server responded with a status of 500 (Internal Server -

Nothing in the logs, I have debug mode turned on, this is all I can find. hope this helps! I can’t wait to start using InvoicePlane!

Edit: When I finally properly enabled logging via the config.php file, I found that the error was due to me not entering in a discount during the quote creation. See logs here:
Specifically this error log:

DEBUG - 2016-06-18 12:52:46 --> DB Transaction Failure
ERROR - 2016-06-18 12:52:46 --> Query error: Incorrect decimal value: '' for column 'item_discount_amount' at row 1

My guess is that the discount field should default to 0 if there’s no discount entered. Is there a way to accomplish this in the settings UI?

Will be fixed in 1.4.7