Objective c - getting exc_bad_access when trying to copy NSArray in queue

Question

I'm trying to copy an array inside a specific queue and sometimes my app crashes with exc_bad_access.

- (NSArray *)safeCopyArrayInQueue:(dispatch_queue_t)queue andArray:(NSArray *)arrayToCopy {
    __block NSArray *copy = nil;
    dispatch_sync(queue, ^{
        @try {
            copy = [NSArray arrayWithArray:arrayToCopy]; // this line crashes
        }
        @catch (NSException *exception) {
            NSLog(@"%@", exception.description);
            copy = @[];
        }
    });

    return copy;
}

Answer 1

I found the issue thanks to Rohan Bhale - the problem occurred because I passed the array as a parameter and it was deallocated before I used it in [NSArray arrayWithArray:] method.

To fix it I used the array as a class variable and access it only inside its queue.