[08:28:01] [Head Conversion Thread - 21/WARN]: Exception in thread "Head Conversion Thread - 21"
[08:28:01] [Head Conversion Thread - 21/WARN]: com.google.common.util.concurrent.UncheckedExecutionException: java.lang.IllegalArgumentException: Name and ID cannot both be blank
[08:28:01] [Head Conversion Thread - 21/WARN]: at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2201)
[08:28:01] [Head Conversion Thread - 21/WARN]: at com.google.common.cache.LocalCache.get(LocalCache.java:3934)
[08:28:01] [Head Conversion Thread - 21/WARN]: at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3938)
[08:28:01] [Head Conversion Thread - 21/WARN]: at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4821)
[08:28:01] [Head Conversion Thread - 21/WARN]: at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4827)
[08:28:01] [Head Conversion Thread - 21/WARN]: at net.minecraft.server.v1_8_R3.TileEntitySkull$3.run(TileEntitySkull.java:172)
[08:28:01] [Head Conversion Thread - 21/WARN]: at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
[08:28:01] [Head Conversion Thread - 21/WARN]: at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
[08:28:01] [Head Conversion Thread - 21/WARN]: at java.lang.Thread.run(Unknown Source)
[08:28:01] [Head Conversion Thread - 21/WARN]: Caused by: java.lang.IllegalArgumentException: Name and ID cannot both be blank
[08:28:01] [Head Conversion Thread - 21/WARN]: at com.mojang.authlib.GameProfile.<init>(GameProfile.java:25)
[08:28:01] [Head Conversion Thread - 21/WARN]: at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.fillGameProfile(YggdrasilMinecraftSessionService.java:181)
[08:28:01] [Head Conversion Thread - 21/WARN]: at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.fillProfileProperties(YggdrasilMinecraftSessionService.java:168)
[08:28:01] [Head Conversion Thread - 21/WARN]: at net.minecraft.server.v1_8_R3.TileEntitySkull$1.load(TileEntitySkull.java:70)
[08:28:01] [Head Conversion Thread - 21/WARN]: at net.minecraft.server.v1_8_R3.TileEntitySkull$1.load(TileEntitySkull.java:1)
[08:28:01] [Head Conversion Thread - 21/WARN]: at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3524)
[08:28:01] [Head Conversion Thread - 21/WARN]: at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2317)
[08:28:01] [Head Conversion Thread - 21/WARN]: at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2280)
[08:28:01] [Head Conversion Thread - 21/WARN]: at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2195)
[08:28:01] [Head Conversion Thread - 21/WARN]: ... 8 more