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When I run 1.8.9 regularly, it gives this crash message:

Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release
Completely ignored arguments: [--nativeLauncherVersion, 308]
[18:58:17] [Client thread/INFO]: Setting user: MTTBrandLegs
[18:58:17] [Client thread/INFO]: (Session ID is <censored>)
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)

When I run 1.8.9 Optifine HD U H6, it simply closes the launcher and doesn't open the game itself.
Help?

Are you using any other mods?

Full log?