Scoreboard client exception

java.util.concurrent.ExecutionException: java.lang.NullPointerException
	at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_40]
	at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_40]
	at h.a(SourceFile:61) [1.8.3.jar:?]
	at avf.av(SourceFile:880) [1.8.3.jar:?]
	at avf.a(SourceFile:325) [1.8.3.jar:?]
	at net.minecraft.client.main.Main.main(SourceFile:124) [1.8.3.jar:?]
Caused by: java.lang.NullPointerException
	at bcz.a(SourceFile:1315) ~[1.8.3.jar:?]
	at hr.a(SourceFile:54) ~[1.8.3.jar:?]
	at hr.a(SourceFile:10) ~[1.8.3.jar:?]
	at fi$1.run(SourceFile:13) ~[1.8.3.jar:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_40]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_40]
	at h.a(SourceFile:60) ~[1.8.3.jar:?]
	... 3 more