Im running osclass version 3.7.4 with Veronika theme.
When creating an ad there is the possibility to select "Check with Seller" option.
When I select this and leave price field empty the system does not allow me to create the ad.

@OCS
Well if check with seller is selected, it's same as if price field is blank.
I checked theme and there is no such condition to make price required so it comes from some other settings.

I have this same problem how fix this ?

@Dawid
Question is what you want to fix

Delete option "check seller" .

@Dawid
This can be done in functions.php

@MB,

I indeed found the issue.
After your comment i went looking for other settings and in the Backoffice Manager under Listings I found the option:
"Price is required when publishing new listing"
Deselected this and it's working now.

Thanks!

@OCS
Ye, well... if price is required, check with seller option will not work.