NullPointerException occured when changing servers

The following text usually appears in the logger provided by the launcher when I'm playing in a Chinese server (inside China without VPN):

Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
	at java.util.concurrent.FutureTask.report(FutureTask.java:122)
	at java.util.concurrent.FutureTask.get(FutureTask.java:192)
	at h.a(SourceFile:47)
	at bhz.az(SourceFile:991)
	at bhz.a(SourceFile:419)
	at net.minecraft.client.main.Main.main(SourceFile:123)
Caused by: java.lang.NullPointerException
	at brx.a(SourceFile:478)
	at ic.a(SourceFile:67)
	at ic.a(SourceFile:14)
	at hv$1.run(SourceFile:13)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at h.a(SourceFile:46)
	... 3 more

This time it appears when the game got stuck. I'm playing the same server. I closed the game after that.

The log and image were attached. I don't know why I can't find the crash report in C:\Users\Cynthia7979\AppData\Roaming\.minecraft\crash-reports. I also attached the game log (latest.log).