While on a 1.21 multiplayer server without VR enabled, I pressed Right Ctrl+R and the game crashed with the following stack trace.

[18:27:35] [Render thread/ERROR]: Unreported exception thrown!
java.lang.NullPointerException: Cannot invoke "org.vivecraft.client_vr.gameplay.VRPlayer.isTeleportOverridden()" because "dataholder.vrPlayer" is null
at org.vivecraft.client_vr.settings.VRHotkeys.handleKeyboardInputs(VRHotkeys.java:64) ~[vivecraft-1.21-1.1.12-b5-fabric.jar:?]
at net.minecraft.class_309.handler$fje000$vivecraft$screenHandler(class_309.java:5646) ~[client-intermediary.jar:?]
at net.minecraft.class_309.method_1466(class_309.java:346) ~[client-intermediary.jar:?]
at net.minecraft.class_309.method_22678(class_309.java:499) ~[client-intermediary.jar:?]
at net.minecraft.class_1255.execute(class_1255.java:108) ~[client-intermediary.jar:?]
at net.minecraft.class_309.method_22676(class_309.java:499) ~[client-intermediary.jar:?]
at org.lwjgl.glfw.GLFWKeyCallback$Container.invoke(GLFWKeyCallback.java:82) ~[lwjgl-glfw-3.3.3.jar:?]
at com.moulberry.flashback.editor.ui.CustomImGuiImplGlfw.keyCallback(CustomImGuiImplGlfw.java:323) ~[flashback-0.10.0.jar:?]
at org.lwjgl.glfw.GLFWKeyCallbackI.callback(GLFWKeyCallbackI.java:44) ~[lwjgl-glfw-3.3.3.jar:?]
at org.lwjgl.system.JNI.invokeV(Native Method) ~[lwjgl-3.3.3.jar:?]
at org.lwjgl.glfw.GLFW.glfwPollEvents(GLFW.java:3438) ~[lwjgl-glfw-3.3.3.jar:?]
at com.mojang.blaze3d.systems.RenderSystem.pollEvents(RenderSystem.java:150) ~[client-intermediary.jar:?]
at com.mojang.blaze3d.systems.RenderSystem.flipFrame(RenderSystem.java:168) ~[client-intermediary.jar:?]
at net.minecraft.class_1041.method_15998(class_1041.java:303) ~[client-intermediary.jar:?]
at net.minecraft.class_310.method_1523(class_310.java:1307) ~[client-intermediary.jar:?]
at net.minecraft.class_310.method_1514(class_310.java:882) [client-intermediary.jar:?]
at net.minecraft.client.main.Main.main(Main.java:256) [client-intermediary.jar:?]
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:470) [fabric-loader-0.15.11.jar:?]
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74) [fabric-loader-0.15.11.jar:?]
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) [fabric-loader-0.15.11.jar:?]
at org.prismlauncher.launcher.impl.StandardLauncher.launch(StandardLauncher.java:100) [NewLaunch.jar:?]
at org.prismlauncher.EntryPoint.listen(EntryPoint.java:129) [NewLaunch.jar:?]
at org.prismlauncher.EntryPoint.main(EntryPoint.java:70) [NewLaunch.jar:?]

it should check if vr is initialized, I'll add it to the cleanup pr

most of these things should generally only trigger with vr on imo.

I'm not able to test this at the moment, but I think adding if (dataholder.vrPlayer != null) { at line 64 of VRHotkeys.java should fix this. I'll open a draft PR in case anyone's able to test it.

Edit: See #300