How to solve NSInvalidArgumentException error?

Question

My app is crashing intermittently for users, but unfortunately I am not able reproduce the problem on any of my devices. The reported error is:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'NSConcreteAttributedString initWithString:: nil value'

The log trace is not clear about the crash source. I have attached a log trace. I'm looking for any pointers that can help me to track this down.

Answer 1

The reason for the crash is in your title...

reason: 'NSConcreteAttributedString initWithString:: nil value'

It looks like you are trying to create an attributed string from a string but that string is nil.

Add a guard before you do you NSAttributeString initWithString to make sure the string isn't nil ie

if (string) {
    NSAttributedString *attributedString = [[NSAttributedString alloc] initWithAttributedString:string];

    //other code etc...
}