Can’t see input field in Price & Currency

Hello,

I try to create new product, but in “Price & Currency” field can’t see input to set the price. I see only radio buttons “One-time payment” and “Donation”… and when try to save product returns this error – Invalid product price: one-time payment product price cannot be zero.

My WP is old version 4.9 and may be this is the problem… but, is there a way to fix this, without updating WP?

Regards!