PaperMC/Spigot-Server-Patches/0106-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/UserCache.java b/src/main/java/net/minecraft/server/UserCache.java
index 15222ed19f049b7465a43a8651584a8a4c5fd666..7171bdf7fb0489e9678588dfa33410984015ea3f 100644
--- a/src/main/java/net/minecraft/server/UserCache.java
+++ b/src/main/java/net/minecraft/server/UserCache.java
@@ -89,7 +89,7 @@ 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);