Null Exception

 java.lang.NullPointerException
at ayy.a(RenderGlobal.java:2455)
at xe.a(World.java:4098)
at xe.f(World.java:4088)
at awr.a(NetClientHandler.java:1229)
at dm.a(SourceFile:45)
at bx.b(TcpConnection.java:441)
at awr.d(NetClientHandler.java:104)
at awz.b(WorldClient.java:72)
at net.minecraft.client.Minecraft.l(Minecraft.java:1826)
at net.minecraft.client.Minecraft.J(Minecraft.java:854)
at net.minecraft.client.Minecraft.run(Minecraft.java:779)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT eb50164e ----------