Swizzle dealloc crash

[codwam]

My code:
`

UIViewController.swizzleInstanceMethod(origSelector: Selector.dealloc, toAlterSelector: Selector.swizzle_dealloc)

@objc
func swizzle_dealloc() {
    #if DEBUG
        print("dealloc：------ \(self))")
    #endif
}

`
Crash in

NSObject+Alive.swift
view.agent?.responder = r

[codwam]

改为下面就好了。
if let agent = view.agent, let _ = agent.responder { view.agent?.responder = r }