app crashed when creating album

How are we supposed to help you with this? What's an album? What code are you running that's causing the crash?

__block PHObjectPlaceholder *placeholder = nil;
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
    PHAssetCollectionChangeRequest *request = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:title];
    placeholder = request.placeholderForCreatedAssetCollection;
} completionHandler:^(BOOL success, NSError *error) {
    if (resultBlock) {
        PhotoAlbum *resultAlbum = nil;
        if (placeholder) {
            PHFetchResult<PHAssetCollection *> *collectionResult = [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[
                placeholder.localIdentifier
                ] options:nil];
            if (collectionResult.count) {
                resultAlbum = [[PhotoAlbum alloc] initWithPHAssetCollection:[collectionResult firstObject]
                                                                        options:[self assetFilterFetchOptions:self.fetchOption]];
            } else {
                success = NO;
                error = [NSError errorWithDomain:kDomain code:AlbumNoFound userInfo:@{@"error" : [NSString stringWithFormat:@"没有找到标题为%@的相册", title]}];
            }
        }
        
        dispatch_async(dispatch_get_main_queue(), ^{
            resultBlock(success, error, resultAlbum);
        });
    }
}];

crash in this:

PHFetchResult<PHAssetCollection *> *collectionResult = [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[
                placeholder.localIdentifier
                ] options:nil];