I customized Mantis for my personal use, one of these customizations is that i made the field "steps to reproduce" required following this help http://www.mantisbt.org/forums/viewtopi ... red#p44500
And it works fine, but a problem appeared, when I wanna change the handler here :

I confirm, and then an error message tells that the required field "steps to reproduce" is empty ... but it has nothing to do with the handler change, I don't understand how it could be linked. Everything else seems to work correctly.
Could someone help me ?
Thanks.