NSTableView unhideRowsAtIndexes crashes

#import "AppDelegate.h"

#import "SectionCellView.h"

@interface Person : NSObject

@end

@interface Person ()

@property (nonatomic, retain) NSString *name;
@end

@implementation Person

- (instancetype)initWithName:(NSString *)name {
    self = [super init];
    if (self) {
        _name = name;
    }
    return self;
}

@end

@interface AppDelegate ()

@property (weak) IBOutlet NSWindow *window;

@property (nonatomic, strong) IBOutlet NSTableView *tableView;
@property (nonatomic, strong) NSMutableArray *tableViewContent;
@end

@implementation AppDelegate

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
    // Insert code here to initialize your application

    self.tableViewContent = [NSMutableArray arrayWithArray:@[@{@"name" : @"person1"}, [[Person alloc] initWithName:@"Peter4"], @{@"name" : @"person2"}, [[Person alloc] initWithName:@"Peter"], @{@"name" : @"person3"}, [[Person alloc] initWithName:@"Peter5"], @{@"name" : @"person4"}, [[Person alloc] initWithName:@"Peter2"], @{@"name" : @"person5"}, [[Person alloc] initWithName:@"Peter3"], @{@"name" : @"person1"}, [[Person alloc] initWithName:@"Peter4"], @{@"name" : @"person2"}, [[Person alloc] initWithName:@"Peter"], @{@"name" : @"person3"}, [[Person alloc] initWithName:@"Peter5"], @{@"name" : @"person4"}, [[Person alloc] initWithName:@"Peter2"], @{@"name" : @"person5"}, [[Person alloc] initWithName:@"Peter3"], @{@"name" : @"person1"}, [[Person alloc] initWithName:@"Peter4"], @{@"name" : @"person2"}, [[Person alloc] initWithName:@"Peter"], @{@"name" : @"person3"}, [[Person alloc] initWithName:@"Peter5"], @{@"name" : @"person4"}, [[Person alloc] initWithName:@"Peter2"], @{@"name" : @"person5"}, [[Person alloc] initWithName:@"Peter3"], @{@"name" : @"person1"}, [[Person alloc] initWithName:@"Peter4"], @{@"name" : @"person2"}, [[Person alloc] initWithName:@"Peter"], @{@"name" : @"person3"}, [[Person alloc] initWithName:@"Peter5"], @{@"name" : @"person4"}, [[Person alloc] initWithName:@"Peter2"], @{@"name" : @"person5"}, [[Person alloc] initWithName:@"Peter3"], @{@"name" : @"person1"}, [[Person alloc] initWithName:@"Peter4"], @{@"name" : @"person2"}, [[Person alloc] initWithName:@"Peter"], @{@"name" : @"person3"}, [[Person alloc] initWithName:@"Peter5"], @{@"name" : @"person4"}, [[Person alloc] initWithName:@"Peter2"], @{@"name" : @"person5"}, [[Person alloc] initWithName:@"Peter3"], @{@"name" : @"person1"}, [[Person alloc] initWithName:@"Peter4"], @{@"name" : @"person2"}, [[Person alloc] initWithName:@"Peter"], @{@"name" : @"person3"}, [[Person alloc] initWithName:@"Peter5"], @{@"name" : @"person4"}, [[Person alloc] initWithName:@"Peter2"], @{@"name" : @"person5"}, [[Person alloc] initWithName:@"Peter3"], @{@"name" : @"person1"}, [[Person alloc] initWithName:@"Peter4"], @{@"name" : @"person2"}, [[Person alloc] initWithName:@"Peter"], @{@"name" : @"person3"}, [[Person alloc] initWithName:@"Peter5"], @{@"name" : @"person4"}, [[Person alloc] initWithName:@"Peter2"], @{@"name" : @"person5"}, [[Person alloc] initWithName:@"Peter3"], @{@"name" : @"person1"}, [[Person alloc] initWithName:@"Peter4"], @{@"name" : @"person2"}, [[Person alloc] initWithName:@"Peter"], @{@"name" : @"person3"}, [[Person alloc] initWithName:@"Peter5"], @{@"name" : @"person4"}, [[Person alloc] initWithName:@"Peter2"], @{@"name" : @"person5"}, [[Person alloc] initWithName:@"Peter3"], @{@"name" : @"person1"}, [[Person alloc] initWithName:@"Peter4"], @{@"name" : @"person2"}, [[Person alloc] initWithName:@"Peter"], @{@"name" : @"person3"}, [[Person alloc] initWithName:@"Peter5"], @{@"name" : @"person4"}, [[Person alloc] initWithName:@"Peter2"], @{@"name" : @"person5"}, [[Person alloc] initWithName:@"Peter3"], @{@"name" : @"person1"}, [[Person alloc] initWithName:@"Peter4"], @{@"name" : @"person2"}, [[Person alloc] initWithName:@"Peter"], @{@"name" : @"person3"}, [[Person alloc] initWithName:@"Peter5"], @{@"name" : @"person4"}, [[Person alloc] initWithName:@"Peter2"], @{@"name" : @"person5"}, [[Person alloc] initWithName:@"Peter3"], @{@"name" : @"person1"}, [[Person alloc] initWithName:@"Peter4"], @{@"name" : @"person2"}, [[Person alloc] initWithName:@"Peter"], @{@"name" : @"person3"}, [[Person alloc] initWithName:@"Peter5"], @{@"name" : @"person4"}, [[Person alloc] initWithName:@"Peter2"], @{@"name" : @"person5"}, [[Person alloc] initWithName:@"Peter3"], @{@"name" : @"person1"}, [[Person alloc] initWithName:@"Peter4"], @{@"name" : @"person2"}, [[Person alloc] initWithName:@"Peter"], @{@"name" : @"person3"}, [[Person alloc] initWithName:@"Peter5"], @{@"name" : @"person4"}, [[Person alloc] initWithName:@"Peter2"], @{@"name" : @"person5"}, [[Person alloc] initWithName:@"Peter3"]]];

    [self.tableView reloadData];
}

- (void)applicationWillTerminate:(NSNotification *)aNotification {
    // Insert code here to tear down your application
}



#pragma mark - NSTableView

#pragma mark Data Source

- (NSInteger)numberOfRowsInTableView:(NSTableView *)tableView {
    return self.tableViewContent.count;
}

- (id)tableView:(NSTableView *)tableView objectValueForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row {
    return [self.tableViewContent objectAtIndex:row];
}

#pragma mark Delegate

- (NSTableRowView *)tableView:(NSTableView *)tableView rowViewForRow:(NSInteger)row {
    return [[NSTableRowView alloc] init];
}

- (NSView *)tableView:(NSTableView *)tableView viewForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row {

    NSView *view = [tableView makeViewWithIdentifier:@"CellView" owner:[tableView delegate]];

    if ([self isSectionRow:row]) {

        view = [tableView makeViewWithIdentifier:@"SectionCellView" owner:[tableView delegate]];
        [[[(SectionCellView *)view collapseButton] cell] setRepresentedObject:[NSString stringWithFormat:@"%lu", row]];
    }

    return view;
}

- (CGFloat)tableView:(NSTableView *)tableView heightOfRow:(NSInteger)row {
    return [self isSectionRow:row] ? 45 : 120;
}

- (BOOL)tableView:(NSTableView *)tableView isGroupRow:(NSInteger)row {
    return [self isSectionRow:row];
}

- (BOOL)isSectionRow:(NSInteger)row {

    id object = [self.tableViewContent objectAtIndex:row];

    if (![object isKindOfClass:[Person class]]) {
        return YES;
    }

    return NO;
}

- (IBAction)collapse:(id)sender {

    NSButton *button = sender;

    NSIndexSet *indexSet = [NSIndexSet indexSetWithIndex:[button.cell.representedObject integerValue]+1];

    if (button.state == NSOnState) {
        [self.tableView hideRowsAtIndexes:indexSet withAnimation:NSTableViewAnimationSlideUp];
    } else {
        [self.tableView unhideRowsAtIndexes:indexSet withAnimation:NSTableViewAnimationSlideDown];
    }
}

@end