`webView.rx.didTerminate` crashed

[ShenYj]

webView.rx.didTerminate
            .do(onNext: { _ in log.error("didTerminate: subscribe") })
            .subscribe(onNext: { webView in webView.reload() })
            .disposed(by: rx.disposeBag)

When I run this codes in my Controller with webview crashed where the controller has not appeared!