When a player comes near another player, the client crashes for both players. The server will remain running.
java.lang.NullPointerException: Cannot invoke "net.minecraft.client.renderer.entity.EntityRenderer.shouldRender(net.minecraft.world.entity.Entity, net.minecraft.client.renderer.culling.Frustum, double, double, double)" because "$$5" is null
at net.minecraft.client.renderer.entity.EntityRenderDispatcher.shouldRender(SourceFile:130)
at net.minecraft.client.renderer.LevelRenderer.extractVisibleEntities(SourceFile:790)
at net.minecraft.client.renderer.LevelRenderer.renderLevel(SourceFile:480)
at net.minecraft.client.renderer.GameRenderer.renderLevel(SourceFile:771)
at net.minecraft.client.renderer.GameRenderer.render(SourceFile:531)
at net.minecraft.client.Minecraft.runTick(SourceFile:1385)
at net.minecraft.client.Minecraft.run(SourceFile:971)
at net.minecraft.client.main.Main.main(SourceFile:250)
I’ve found that, with a dedicated server, all clients crash and the server stays up. With a LAN world, the host client/server crashes and the would-be other client just says disconnected.