Database Error when clicking Purchase

After choosing my shipping which is hooked up to UPS and then I fillout personal info and hit the purchase button. First it would send me to paypal and say that there was an error detected. then when i turned on WP_DEBUG I finally saw that I was getting this problem below. “pnp” is the shipping cost if I am correct which I’ not sure why it wouldnt be passing over if the radio box is selected. I Have tripple checked that everything is fille dout on the product page as well. Here is the error:

WordPress database error: [Column ‘pnp’ cannot be null]
INSERT INTO wp_jfr7qm_wpsc_cart_contents (prodid, name, purchaseid, price, pnp, tax_charged, gst, quantity, donation, no_shipping, custom_message, files, meta) VALUES (111, ‘Native Tribal (Black, 30)’, 19, 149.000000, NULL, 0.000000, 0.000000, ‘1’, 0, 0, ”, ‘N;’, NULL)

https://wordpress.org/plugins/wp-e-commerce/