Can confirm for 1.10 but to also add on Im a very committed survival player that plays all legit which means no commands and such of the sort. I recently received this error in an all legit survival world that I have had for almost a year now. I am going to put the logs below(As you can see I am using optifine but I am quite sure its not the issue):
[18:45:17] [Server thread/INFO]: Saving chunks for level 'Avience 2.6.2'/Overworld
java.lang.IllegalArgumentException: Name and ID cannot both be blank
at com.mojang.authlib.GameProfile.<init>(GameProfile.java:25)
at ml.a(SourceFile:81)
at ml.a(SourceFile:140)
at vv.b(SourceFile:455)
at vx.b(SourceFile:228)
at baj.a(SourceFile:92)
at baj.a(SourceFile:78)
at ls.a(SourceFile:927)
at ls.a(SourceFile:879)
at net.minecraft.server.MinecraftServer.a(SourceFile:372)
at bzl.a(IntegratedServer.java:324)
at bzl.C(IntegratedServer.java:224)
at net.minecraft.server.MinecraftServer.run(SourceFile:458)
at java.lang.Thread.run(Thread.java:745)
[18:45:18] [Server thread/INFO]: Saving chunks for level 'Avience 2.6.2'/Nether
[18:45:18] [Server thread/INFO]: Saving chunks for level 'Avience 2.6.2'/The End
[18:45:18] [Server thread/WARN]: Keeping entity EntityHorse that already exists with UUID f6989676-042a-46bb-962c-ac7632c51754
java.lang.IllegalArgumentException: Name and ID cannot both be blank
at com.mojang.authlib.GameProfile.<init>(GameProfile.java:25)
at ml.a(SourceFile:81)
at ml.a(SourceFile:140)
at vv.b(SourceFile:455)
at vx.b(SourceFile:228)
at baj.a(SourceFile:92)
at baj.a(SourceFile:78)
at ls.a(SourceFile:927)
at ls.a(SourceFile:879)
at net.minecraft.server.MinecraftServer.a(SourceFile:372)
at bzl.a(IntegratedServer.java:324)
at net.minecraft.server.MinecraftServer.C(SourceFile:572)
at bzl.C(IntegratedServer.java:239)
at net.minecraft.server.MinecraftServer.run(SourceFile:458)
at java.lang.Thread.run(Thread.java:745)
[18:46:01] [Server thread/WARN]: Keeping entity EntityHorse that already exists with UUID f6989676-042a-46bb-962c-ac7632c51754
[18:46:13] [Server thread/INFO]: Saving and pausing game...
[18:46:13] [Server thread/INFO]: Saving chunks for level 'Avience 2.6.2'/Overworld
[18:46:13] [Server thread/INFO]: Saving chunks for level 'Avience 2.6.2'/Nether
[18:46:13] [Server thread/INFO]: Saving chunks for level 'Avience 2.6.2'/The End
[18:46:45] [Server thread/WARN]: Keeping entity EntityHorse that already exists with UUID f6989676-042a-46bb-962c-ac7632c51754
java.lang.IllegalArgumentException: Name and ID cannot both be blank
at com.mojang.authlib.GameProfile.<init>(GameProfile.java:25)
at ml.a(SourceFile:81)
at ml.a(SourceFile:140)
at vv.b(SourceFile:455)
at vx.b(SourceFile:228)
at baj.a(SourceFile:92)
at baj.a(SourceFile:78)
at ls.a(SourceFile:927)
at ls.a(SourceFile:879)
at net.minecraft.server.MinecraftServer.a(SourceFile:372)
at bzl.a(IntegratedServer.java:324)
at net.minecraft.server.MinecraftServer.C(SourceFile:572)
at bzl.C(IntegratedServer.java:239)
at net.minecraft.server.MinecraftServer.run(SourceFile:458)
at java.lang.Thread.run(Thread.java:745)
[18:47:18] [Server thread/WARN]: Keeping entity EntityHorse that already exists with UUID f6989676-042a-46bb-962c-ac7632c51754
java.lang.IllegalArgumentException: Name and ID cannot both be blank
at com.mojang.authlib.GameProfile.<init>(GameProfile.java:25)
at ml.a(SourceFile:81)
at ml.a(SourceFile:140)
at vv.b(SourceFile:455)
at vx.b(SourceFile:228)
at baj.a(SourceFile:92)
at baj.a(SourceFile:78)
at ls.a(SourceFile:927)
at ls.a(SourceFile:879)
at net.minecraft.server.MinecraftServer.a(SourceFile:372)
at bzl.a(IntegratedServer.java:324)
at net.minecraft.server.MinecraftServer.C(SourceFile:572)
at bzl.C(IntegratedServer.java:239)
at net.minecraft.server.MinecraftServer.run(SourceFile:458)
at java.lang.Thread.run(Thread.java:745)
[18:48:03] [Server thread/WARN]: Keeping entity EntityHorse that already exists with UUID f6989676-042a-46bb-962c-ac7632c51754
[18:48:34] [Server thread/INFO]: Saving and pausing game...
[18:48:34] [Server thread/INFO]: Saving chunks for level 'Avience 2.6.2'/Overworld
java.lang.IllegalArgumentException: Name and ID cannot both be blank
at com.mojang.authlib.GameProfile.<init>(GameProfile.java:25)
at ml.a(SourceFile:81)
at ml.a(SourceFile:140)
at vv.b(SourceFile:455)
at vx.b(SourceFile:228)
at baj.a(SourceFile:92)
at baj.a(SourceFile:78)
at ls.a(SourceFile:927)
at ls.a(SourceFile:879)
at net.minecraft.server.MinecraftServer.a(SourceFile:372)
at bzl.a(IntegratedServer.java:324)
at bzl.C(IntegratedServer.java:224)
at net.minecraft.server.MinecraftServer.run(SourceFile:458)
at java.lang.Thread.run(Thread.java:745)
[18:48:34] [Server thread/INFO]: Saving chunks for level 'Avience 2.6.2'/Nether
[18:48:34] [Server thread/INFO]: Saving chunks for level 'Avience 2.6.2'/The End
[18:48:40] [Server thread/INFO]: Changing view distance to 10, from 2
[18:48:40] [Server thread/WARN]: Keeping entity EntityHorse that already exists with UUID f6989676-042a-46bb-962c-ac7632c51754
[18:48:40] [Client thread/WARN]: Received passengers for unknown entity
java.lang.IllegalArgumentException: Name and ID cannot both be blank
at com.mojang.authlib.GameProfile.<init>(GameProfile.java:25)
at ml.a(SourceFile:81)
at ml.a(SourceFile:140)
at vv.b(SourceFile:455)
at vx.b(SourceFile:228)
at baj.a(SourceFile:92)
at baj.a(SourceFile:78)
at ls.a(SourceFile:927)
at ls.a(SourceFile:879)
at net.minecraft.server.MinecraftServer.a(SourceFile:372)
at bzl.a(IntegratedServer.java:324)
at net.minecraft.server.MinecraftServer.C(SourceFile:572)
at bzl.C(IntegratedServer.java:239)
at net.minecraft.server.MinecraftServer.run(SourceFile:458)
at java.lang.Thread.run(Thread.java:745)
[18:49:15] [Client thread/ERROR]: Item entity 25189 has no item?!
[18:49:15] [Client thread/ERROR]: Item entity 25189 has no item?!
java.lang.IllegalArgumentException: Name and ID cannot both be blank
at com.mojang.authlib.GameProfile.<init>(GameProfile.java:25)
at ml.a(SourceFile:81)
at ml.a(SourceFile:140)
at vv.b(SourceFile:455)
at vx.b(SourceFile:228)
at baj.a(SourceFile:92)
at baj.a(SourceFile:78)
at ls.a(SourceFile:927)
at ls.a(SourceFile:879)
at net.minecraft.server.MinecraftServer.a(SourceFile:372)
at bzl.a(IntegratedServer.java:324)
at net.minecraft.server.MinecraftServer.C(SourceFile:572)
at bzl.C(IntegratedServer.java:239)
at net.minecraft.server.MinecraftServer.run(SourceFile:458)
at java.lang.Thread.run(Thread.java:745)
java.lang.IllegalArgumentException: Name and ID cannot both be blank
at com.mojang.authlib.GameProfile.<init>(GameProfile.java:25)
at ml.a(SourceFile:81)
at ml.a(SourceFile:140)
at vv.b(SourceFile:455)
at vx.b(SourceFile:228)
at baj.a(SourceFile:92)
at baj.a(SourceFile:78)
at ls.a(SourceFile:927)
at ls.a(SourceFile:879)
at net.minecraft.server.MinecraftServer.a(SourceFile:372)
at bzl.a(IntegratedServer.java:324)
at net.minecraft.server.MinecraftServer.C(SourceFile:572)
at bzl.C(IntegratedServer.java:239)
at net.minecraft.server.MinecraftServer.run(SourceFile:458)
at java.lang.Thread.run(Thread.java:745)
java.lang.IllegalArgumentException: Name and ID cannot both be blank
at com.mojang.authlib.GameProfile.<init>(GameProfile.java:25)
at ml.a(SourceFile:81)
at ml.a(SourceFile:140)
at vv.b(SourceFile:455)
at vx.b(SourceFile:228)
at baj.a(SourceFile:92)
at baj.a(SourceFile:78)
at ls.a(SourceFile:927)
at ls.a(SourceFile:879)
at net.minecraft.server.MinecraftServer.a(SourceFile:372)
at bzl.a(IntegratedServer.java:324)
at net.minecraft.server.MinecraftServer.C(SourceFile:572)
at bzl.C(IntegratedServer.java:239)
at net.minecraft.server.MinecraftServer.run(SourceFile:458)
at java.lang.Thread.run(Thread.java:745)
java.lang.IllegalArgumentException: Name and ID cannot both be blank
at com.mojang.authlib.GameProfile.<init>(GameProfile.java:25)
at ml.a(SourceFile:81)
at ml.a(SourceFile:140)
at vv.b(SourceFile:455)
at vx.b(SourceFile:228)
at baj.a(SourceFile:92)
at baj.a(SourceFile:78)
at ls.a(SourceFile:927)
at ls.a(SourceFile:879)
at net.minecraft.server.MinecraftServer.a(SourceFile:372)
at bzl.a(IntegratedServer.java:324)
at net.minecraft.server.MinecraftServer.C(SourceFile:572)
at bzl.C(IntegratedServer.java:239)
at net.minecraft.server.MinecraftServer.run(SourceFile:458)
at java.lang.Thread.run(Thread.java:745)
[18:52:36] [Client thread/ERROR]: Item entity 141202 has no item?!
[18:52:36] [Client thread/ERROR]: Item entity 141202 has no item?!
[18:55:04] [Client thread/WARN]: Received passengers for unknown entity
[18:55:14] [Server thread/WARN]: Keeping entity EntityHorse that already exists with UUID f6989676-042a-46bb-962c-ac7632c51754
[18:55:15] [Client thread/WARN]: Received passengers for unknown entity
[18:55:22] [Client thread/WARN]: Received passengers for unknown entity
[18:55:25] [Client thread/WARN]: Received passengers for unknown entity
[18:55:27] [Client thread/WARN]: Received passengers for unknown entity
[18:55:28] [Client thread/WARN]: Received passengers for unknown entity
[18:55:49] [Client thread/WARN]: Received passengers for unknown entity
[18:56:03] [Client thread/WARN]: Received passengers for unknown entity
[19:07:58] [Client Shutdown Thread/INFO]: Stopping server
[19:07:58] [Client Shutdown Thread/INFO]: Saving players
Can confirm for 1.10 but to also add on Im a very committed survival player that plays all legit which means no commands and such of the sort. I recently received this error in an all legit survival world that I have had for almost a year now. I am going to put the logs below(As you can see I am using optifine but I am quite sure its not the issue):