核心数据二进制数据，允许外部存储崩溃

我在iOS 12.0.1上的以下日志崩溃了：

ImageIO: CFDataGetBytes: data: 0x28539b2f0 size: 154262 offset: 8 count: 8 dst: 0x16dbf86f0
    External data reference cant find underlying file.
    Fatal Exception: NSInternalInconsistencyException
        0  CoreFoundation                 0x23c2d7ef8 __exceptionPreprocess
        1  libobjc.A.dylib                0x23b4a5a40 objc_exception_throw
        2  CoreData                       0x23efd5fc8 -[_PFExternalReferenceData getBytes:range:]
        3  ImageIO                        0x23e6c7178 IIOImageRead::getCFDataBytesAtOffset(void*, unsigned long, unsigned long)
        4  ImageIO                        0x23e6c6c38 IIOImageRead::getBytesAtOffset(void*, unsigned long, unsigned long)
        5  ImageIO                        0x23e711aa4 IIO_Reader_PNG::getImageCount(IIOImageReadSession*, IIODictionary*, int*, unsigned int*)
        6  ImageIO                        0x23e54c5d8 IIO_Reader::callGetImageCount(CGImageReadSession*, IIODictionary*, int*)
        7  ImageIO                        0x23e532194 IIOImageSource::updatedCount()
        8  ImageIO                        0x23e5367b4 CGImageSourceGetCount
        9  UIKitCore                      0x26960c1a4 _UIImageRefFromData
        10 UIKitCore                      0x268d4e15c -[UIImage(UIImagePrivate) _initWithData:preserveScale:cache:]
        11 UIKitCore                      0x268d48b7c +[UIImage imageWithData:]
        12 MyApp                          0x102239570 __48-[InfoPreviewController bindToPatient:]_block_invoke_2 (InfoPreviewController.m:83)
        13 ReactiveObjC                   0x1031f8004 -[RACSubscriber sendNext:] (RACSubscriber.m:72)

似乎核心数据具有该图像，但是当它尝试检索它时，它将失败。

在这种情况下，如何验证数据完整性？我想以用户友好的方式处理此故障，而不是使应用程序崩溃。