Booking bug - 0

Dear Balbooa team,
I have a problem with the booking app. After a few modification in the booking system I had a problem after submitting. For the first try it was working but now I've been redirected to an error page "0".

https://mombon.hu/index.php/gyermekprogramok/gyermektabor

On this site I should be able to create more type of services to book.
One takes for 5 days from morning till the afternoons and is available every week from July till August (specific dates).
Other services should be booked every Saturday (one early afternoon and another one in the evening).

I also should give extra discount for one of the services after each booking for a camp after every brothers or sisters.
I couldn't find any solutions for these problems.

I'd be pleased and grateful for any help, especially about the checkout, but also about the other issues.

Thanks and have a nice day,
Greg

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