ERROR.

Error executing task on Client
java.lang.NullPointerException: Cannot invoke "fhk.d(String)" because "this.m.t" is null
    at fdk.a(SourceFile:1973)
    at wc.a(SourceFile:60)
    at wc.a(SourceFile:8)
    at vd.lambda$checkThreadAndEnqueue$0(PacketUtils.java:40)
    at net.optifine.util.PacketRunnable.run(PacketRunnable.java:28)
    at bco.d(BlockableEventLoop.java:198)
    at bcs.d(SourceFile:23)
    at bco.x(BlockableEventLoop.java:163)
    at bco.br(BlockableEventLoop.java:140)
    at emh.f(SourceFile:1174)
    at emh.e(SourceFile:801)
    at net.minecraft.client.main.Main.main(SourceFile:237)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:568)
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:159)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:30)