Fix crash on redefine class...?
Fix crash on redefine class...?

chenee/JavaScriptBridge,kishikawakatsumi/JavaScriptBridge,ywzw2013/JavaScriptBridge,chenee/JavaScriptBridge,kishikawakatsumi/JavaScriptBridge,Sellegit/JavaScriptBridge,dachaoisme/JavaScriptBridge,Sellegit/JavaScriptBridge