Hello. Baritone can't follow players with a weird username.

[15:34:31] [main/INFO]: [CHAT] [Fabritone] > follow player (username that starts and ends with an underscore)
[15:34:31] [main/INFO]: [CHAT] [Fabritone] Following these types of entities:
[15:34:31] [main/INFO]: [CHAT] [Fabritone] An unhandled exception occurred. The error is in your game's log, please report this at https://github.com/cabaletta/baritone/issues
[15:34:31] [main/INFO]: [STDERR]: baritone.api.command.exception.CommandUnhandledException: java.lang.NullPointerException
[15:34:31] [main/INFO]: [STDERR]: at baritone.command.manager.CommandManager$ExecutionWrapper.execute(CommandManager.java:145)
[15:34:31] [main/INFO]: [STDERR]: at baritone.command.manager.CommandManager$ExecutionWrapper.access$000(CommandManager.java:128)
[15:34:31] [main/INFO]: [STDERR]: at baritone.command.manager.CommandManager.execute(CommandManager.java:84)
[15:34:31] [main/INFO]: [STDERR]: at baritone.command.BaritoneChatControl.runCommand(BaritoneChatControl.java:145)
[15:34:31] [main/INFO]: [STDERR]: at baritone.command.BaritoneChatControl.onSendChatMessage(BaritoneChatControl.java:70)
[15:34:31] [main/INFO]: [STDERR]: at baritone.event.GameEventHandler.lambda$onSendChatMessage$2(GameEventHandler.java:70)
[15:34:31] [main/INFO]: [STDERR]: at baritone.event.GameEventHandler$$Lambda$4003/294237682.accept(Unknown Source)
[15:34:31] [main/INFO]: [STDERR]: at java.util.concurrent.CopyOnWriteArrayList.forEach(CopyOnWriteArrayList.java:890)
[15:34:31] [main/INFO]: [STDERR]: at baritone.event.GameEventHandler.onSendChatMessage(GameEventHandler.java:70)
[15:34:31] [main/INFO]: [STDERR]: at net.minecraft.class_746.handler$zcj000$sendChatMessage(class_746.java:1250)
[15:34:31] [main/INFO]: [STDERR]: at net.minecraft.class_746.method_3142(class_746.java)
[15:34:31] [main/INFO]: [STDERR]: at net.minecraft.class_437.sendMessage(class_437.java:326)
[15:34:31] [main/INFO]: [STDERR]: at net.minecraft.class_437.sendMessage(class_437.java:319)
[15:34:31] [main/INFO]: [STDERR]: at net.optifine.gui.GuiChatOF.sendMessage(GuiChatOF.java:41)
[15:34:31] [main/INFO]: [STDERR]: at net.minecraft.class_408.keyPressed(class_408.java:95)
[15:34:31] [main/INFO]: [STDERR]: at net.minecraft.class_309.method_1454(class_309.java:336)
[15:34:31] [main/INFO]: [STDERR]: at net.minecraft.class_309$$Lambda$3991/1356757853.run(Unknown Source)
[15:34:31] [main/INFO]: [STDERR]: at net.minecraft.class_437.wrapScreenError(class_437.java:447)
[15:34:31] [main/INFO]: [STDERR]: at net.minecraft.class_309.method_1466(class_309.java:334)
[15:34:31] [main/INFO]: [STDERR]: at net.minecraft.class_309.lambda$null$7(class_309.java:627)
[15:34:31] [main/INFO]: [STDERR]: at net.minecraft.class_309$$Lambda$3968/157211110.run(Unknown Source)
[15:34:31] [main/INFO]: [STDERR]: at net.minecraft.class_1255.execute(class_1255.java:104)
[15:34:31] [main/INFO]: [STDERR]: at net.minecraft.class_309.lambda$setupCallbacks$8(class_309.java:626)
[15:34:31] [main/INFO]: [STDERR]: at net.minecraft.class_309$$Lambda$1662/890250372.invoke(Unknown Source)
[15:34:31] [main/INFO]: [STDERR]: at org.lwjgl.glfw.GLFWKeyCallbackI.callback(GLFWKeyCallbackI.java:37)
[15:34:31] [main/INFO]: [STDERR]: at org.lwjgl.system.JNI.invokeV(Native Method)
[15:34:31] [main/INFO]: [STDERR]: at org.lwjgl.glfw.GLFW.glfwPollEvents(GLFW.java:3101)
[15:34:31] [main/INFO]: [STDERR]: at com.mojang.blaze3d.systems.RenderSystem.flipFrame(RenderSystem.java:98)
[15:34:31] [main/INFO]: [STDERR]: at net.minecraft.class_1041.method_15998(class_1041.java:363)
[15:34:31] [main/INFO]: [STDERR]: at net.minecraft.class_310.method_1523(class_310.java:1012)
[15:34:31] [main/INFO]: [STDERR]: at net.minecraft.class_310.method_1514(class_310.java:619)
[15:34:31] [main/INFO]: [STDERR]: at net.minecraft.client.main.Main.main(Main.java:204)
[15:34:31] [main/INFO]: [STDERR]: at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[15:34:31] [main/INFO]: [STDERR]: at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[15:34:31] [main/INFO]: [STDERR]: at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[15:34:31] [main/INFO]: [STDERR]: at java.lang.reflect.Method.invoke(Method.java:497)
[15:34:31] [main/INFO]: [STDERR]: at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:192)
[15:34:31] [main/INFO]: [STDERR]: at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:140)
[15:34:31] [main/INFO]: [STDERR]: at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:26)
[15:34:31] [main/INFO]: [STDERR]: Caused by: java.lang.NullPointerException
[15:34:31] [main/INFO]: [STDERR]: at baritone.command.defaults.FollowCommand$$Lambda$4256/120659815.apply(Unknown Source)
[15:34:31] [main/INFO]: [STDERR]: at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
[15:34:31] [main/INFO]: [STDERR]: at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1374)
[15:34:31] [main/INFO]: [STDERR]: at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:512)
[15:34:31] [main/INFO]: [STDERR]: at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502)
[15:34:31] [main/INFO]: [STDERR]: at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
[15:34:31] [main/INFO]: [STDERR]: at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
[15:34:31] [main/INFO]: [STDERR]: at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
[15:34:31] [main/INFO]: [STDERR]: at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
[15:34:31] [main/INFO]: [STDERR]: at baritone.command.defaults.FollowCommand.execute(FollowCommand.java:81)
[15:34:31] [main/INFO]: [STDERR]: at baritone.command.manager.CommandManager$ExecutionWrapper.execute(CommandManager.java:142)
[15:34:31] [main/INFO]: [STDERR]: ... 38 more
[15:34:36] [pool-5-thread-2/INFO]: [STDOUT]: World save took 2ms