add EKAttendee on EKEvent, but happen crash issue on iOS16.4

on iOS16.4, if try to add EKAttendee on EKEvent, it will cause app crash; this can not reproduce on iOS14.5/iOS15.7 etc low version.

Add Main Attendee code:

Class className = NSClassFromString(@"EKAttendee");

        NSMutableArray *attendeessystem = [NSMutableArray new];

        for(int i=0; I<1;i++){

            id attendee = [className new];

[attendee setValue:@"test" forKey:@"firstName"];

[attendee setValue:@"hihi" forKey:@"lastName"];

[attendee setValue:@"test@outlook.com" forKey:@"emailAddress"];

[attendeessystem addObject:attendee];

        }

        if([attendeessystem count]>0)

        {

            [calendarEvent setValue:attendeessystem forKey:@"attendees"];

        }

crash log:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSDictionaryM setObject:forKeyedSubscript:]: key cannot be nil'

*** First throw call stack: