Minecraft crashes after I press play

[21:05:22] [Client thread/INFO]: Setting user: Katie_lolipop
[21:05:22] [Client thread/INFO]: (Session ID is token:091a327cee4f4c27b953bbb61c9167ee:aa200051760a471cb6d7dc871566cd45)
Exception in thread "Client thread" java.lang.NullPointerException
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:213)
at com.google.common.collect.Lists$ReverseList.<init>(Lists.java:767)
at com.google.common.collect.Lists.reverse(Lists.java:759)
at lt.b(SourceFile:156)
at lt.<init>(SourceFile:43)
at net.minecraft.server.MinecraftServer.<init>(SourceFile:155)
at bpo.<init>(SourceFile:41)
at ave.<init>(SourceFile:293)
at net.minecraft.client.main.Main.main(SourceFile:124)