For fucks sake, how many times can you get the same error before giving up?

So, there's this form, and it's used quite frequently without fail, and there's this 1 user receiving an error that some data is incorrect, so... they submit the form again, and again, and again, and 6 more times with the same bloody error all because changing 1 fucking field is obviously to hard to recognise as the problem when the error says "you can not have 'x' in field 'y'"

Fuck it, do I need to replace 'x' with a blank, just because you can't read a fucking error message?