PaperMC/Spigot-Server-Patches/0107-Don-t-lookup-game-profiles-that-have-no-UUID-and-no-.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Zach Brown <zach.brown@destroystokyo.com>
Date: Sat, 16 Jul 2016 19:11:17 -0500
Subject: [PATCH] Don't lookup game profiles that have no UUID and no name


diff --git a/src/main/java/net/minecraft/server/players/UserCache.java b/src/main/java/net/minecraft/server/players/UserCache.java
index 2de2d84a56183435d641ba857472276821a70ae0..6c349128bdedc53003f043c9cb1210b4666aee33 100644
--- a/src/main/java/net/minecraft/server/players/UserCache.java
+++ b/src/main/java/net/minecraft/server/players/UserCache.java
@@ -91,7 +91,7 @@ public class UserCache {
         gameprofilerepository.findProfilesByNames(new String[]{s}, Agent.MINECRAFT, profilelookupcallback);
         GameProfile gameprofile = (GameProfile) atomicreference.get();
 
-        if (!c() && gameprofile == null) {
+        if (!c() && gameprofile == null && !org.apache.commons.lang3.StringUtils.isBlank(s)) { // Paper - Don't lookup a profile with a blank name
             UUID uuid = EntityHuman.a(new GameProfile((UUID) null, s));
 
             gameprofile = new GameProfile(uuid, s);