Minecraft segfault on exit

[Victor Engmark]

To reproduce:
1. mkdir ~/.minecraft
2. wget -O ~/.minecraft/minecraft.jar https://s3.amazonaws.com/MinecraftDownload/launcher/minecraft.jar
3. java -Xmx1024M -Xms512M -cp ~/.minecraft/minecraft.jar net.minecraft.LauncherFrame 2>&1 > ~/java-log.txt
3a. If you exit now, there's no error message
4. Log in with valid Minecraft credentials.
5. Wait for the package downloads to finish
6. Quit immediately.

The result: A segfault reported in ~/java-log.txt and the following shell output:

java.io.FileNotFoundException: /home/victor/.minecraft/lastlogin (No such file or directory)
 at java.io.FileInputStream.open(Native Method)
 at java.io.FileInputStream.<init>(FileInputStream.java:137)
 at net.minecraft.LoginForm.readUsername(LoginForm.java:131)
 at net.minecraft.LoginForm.<init>(LoginForm.java:76)
 at net.minecraft.LauncherFrame.<init>(LauncherFrame.java:24)
 at net.minecraft.LauncherFrame.main(LauncherFrame.java:152)
Aborted (core dumped)