Kinarobin

@ealeksandrov making a circular is available？

@WJustin @jschedler-imvu @Johnlee666 Please provide a full crash log.

```objc Thread 44 EXC_BREAKPOINT (SIGTRAP) 0 | CoreFoundation | _CFDataGetBytes() 1 | ImageIO | _CGImageGetImageSource() 2 | ImageIO | _CGImageGetImageSource() 3 | UIKitCore | -[_UIImageCGImageContent initWithCGImage:scale:]() 4 | UIKitCore |...

@WJustin @Johnlee666 @tomsemi @jschedler-imvu Could you take a look in #3276 ?

@MainasuK I can't reproduce with your demo in iPhone 12 & iOS 15 & Xcode 13.0 or simulator.

Which version in your machine ?

@dreampiggy I guess `CGImageSourceRef _imageSource` in `SDImageIOAnimatedCoder` class is not thread safety.

In iOS 15 UIImage using new class in `_UIImageCGImageContent`, but in iOS14 never. ```objc [_UIImageCGImageContent initWithCGImage:scale:] _CGImageGetImageSource() // The obtained _imageSource may be NULL. ``` 

@a130785 The crash stack is same as above?

@xuliang2015 丢失属性是因为 当在递归的时候发现这个模型对应的属性为空的时候，直接返回了，没有走 `if (!dic[propertyMeta->_mappedToKey]) { dic[propertyMeta->_mappedToKey] = value; }` 这个方法，导致字典里面没有这个key