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NPE Crash At java.net.Proxy.type()

See original GitHub issue

okhttp3 Version: 3.10.0 Device/Android Version: vivo 1719;Android 7.1.2,level 25 Redmi Note 3;Android 8.1.0,level 27 SM-G570Y;Android 7.0,level 24

Crash Report:

java.lang.NullPointerException: Attempt to invoke virtual method 'java.net.Proxy$Type java.net.Proxy.type()' on a null object reference 
okhttp3.internal.http.RetryAndFollowUpInterceptor.okhttp3.Request followUpRequest(okhttp3.Response,okhttp3.Route)(SourceFile:282) 
okhttp3.internal.http.RetryAndFollowUpInterceptor.okhttp3.Response intercept(okhttp3.Interceptor$Chain)(SourceFile:158) 
okhttp3.internal.http.RealInterceptorChain.okhttp3.Response proceed(okhttp3.Request,okhttp3.internal.connection.StreamAllocation,okhttp3.internal.http.HttpCodec,okhttp3.internal.connection.RealConnection)(SourceFile:147) 
okhttp3.internal.http.RealInterceptorChain.okhttp3.Response proceed(okhttp3.Request)(SourceFile:121) 
okhttp3.RealCall.okhttp3.Response getResponseWithInterceptorChain()(SourceFile:200) 
okhttp3.RealCall$AsyncCall.void execute()(SourceFile:147) 
okhttp3.internal.NamedRunnable.void run()(SourceFile:32) 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
java.lang.Thread.run(Thread.java:818)

the case almost is same like #3809,but I wonder why it returns null Proxy(eg below code shown) and how do solve it? code fo resulting in crash.

private Request followUpRequest(Response userResponse, Route route) throws IOException {
    .............
    switch (responseCode) {
      case HTTP_PROXY_AUTH:
        Proxy selectedProxy = route != null
            ? route.proxy()
            : client.proxy();
        if (selectedProxy.type() != Proxy.Type.HTTP) {
          throw new ProtocolException("Received HTTP_PROXY_AUTH (407) code while not using proxy");
        }
        return client.proxyAuthenticator().authenticate(route, userResponse);
      ........
}