Quotes causing critical error on website

HI I’m having an issue with quotes at present, saving the quote before sending to client, sending to client and pretty much most things seem to get there’s been and critical error on your website.

The save does happen, the email does get sent but not sure on the crash. I need to enable php error log to get you that but if you can recreate your end you might find the solution before I can get you that code.

regards