Fixed a crash caused by unintuitive objc_msgSend behavior on arm64

For more info, check out "Dispatch Objective-C Messages Using the Method Function's Prototype" here:
https://developer.apple.com/library/ios/documentation/General/Conceptual/CocoaTouch64BitGuide/ConvertingYourAppto64-Bit/ConvertingYourAppto64-Bit.html