Unable to use AVAudioRecorder, bad access on com.apple.audio.IOThread.client

Question

I'm working on a simple Cocoa application that retrieve the meters from an AVAudioRecorder. Here is my code:

@interface AppDelegate () <AVAudioRecorderDelegate>

@property (weak) IBOutlet NSWindow *window;
@property (strong) AVAudioRecorder *recorder;
@property (strong) NSURL *dump;

@end

@implementation AppDelegate

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
    NSDictionary *settings = @{AVSampleRateKey: @(44100.0),
                               AVNumberOfChannelsKey: @2,
                               AVFormatIDKey: @(kAudioFormatAppleLossless),
                               AVEncoderAudioQualityKey: @(AVAudioQualityHigh)
                               };
    NSError *error = nil;
    self.dump = [[NSURL alloc] initFileURLWithPath: [NSTemporaryDirectory() stringByAppendingString: @"dump"]];
    self.recorder = [[AVAudioRecorder alloc] initWithURL: self.dump
                                                settings: settings
                                                   error: &error];
    NSLog(@"Recorder, got error? %@", error);
    self.recorder.delegate = self;

    [self.recorder prepareToRecord];
    self.recorder.meteringEnabled = YES;
    [self.recorder record];
}

@end

I also have a timer that retrieves the meters every second. It works on my laptop but on my iMac, for some reason I have a BAD_ACCESS on "com.apple.audio.IOThread.client (8)" when I call record.

Any idea ?

Thanks!