Somebody know best way how to controll Meteor.methods result from client-Side

Hi, guys. I just wonder about Meteor.methods result stub. When i used, i tried handle result set but when result set out of range from area that return undefined. So I think if i use Session it can be solve. but sometime that way isn’t work. So, if you guys, have you know best way to controll that topic, let me know your solutions!!