Submission failed

Dear Zoho Team,

sometimes when people try to submit a filled application form the submission failes and the message "null" apears in the iframe. I guess its because of a slow internet connection on their side. However, would it be possible to have a specific message apear in these cases instead of "null"? Perhaps something like "Unfortunately we didnt receive your application, please try again later". Even better would be if applicants who encounter the issue could be redirected to a specific small webpage. This way it would look more professional.

Thank you very much in advance and with best regards,
Andreas Michel