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java.lang.NullPointerException at com.mojang.authlib.GameProfile.hashCode(GameProfile.java:90)[minecraft_server.jar:?] at java.util.WeakHashMap.hash(WeakHashMap.java:365)[?:1.7.0_51] at java.util.WeakHashMap.put(WeakHashMap.java:517)[?:1.7.0_51] at org.apache.commons.lang3.builder.ToStringStyle.register(ToStringStyle.java:191)[minecraft_server.jar:?] at org.apache.commons.lang3.builder.ToStringStyle.appendClassName(ToStringStyle.java:1453)[minecraft_server.jar:?] at org.apache.commons.lang3.builder.ToStringStyle.appendStart(ToStringStyle.java:378)[minecraft_server.jar:?] at org.apache.commons.lang3.builder.ToStringBuilder.<init>(ToStringBuilder.java:263)[minecraft_server.jar:?] at org.apache.commons.lang3.builder.ToStringBuilder.<init>(ToStringBuilder.java:226)[minecraft_server.jar:?] at com.mojang.authlib.GameProfile.toString(GameProfile.java:97)[minecraft_server.jar:?] at ov.d(SourceFile:102)[minecraft_server.jar:?] at ov.a(SourceFile:93)[minecraft_server.jar:?] at ok.c(SourceFile:130)[minecraft_server.jar:?] at net.minecraft.server.MinecraftServer.v(SourceFile:555)[minecraft_server.jar:?] at nb.v(SourceFile:264)[minecraft_server.jar:?] at net.minecraft.server.MinecraftServer.u(SourceFile:471)[minecraft_server.jar:?] at net.minecraft.server.MinecraftServer.run(SourceFile:387)[minecraft_server.jar:?] at mr.run(SourceFile:657)[minecraft_server.jar:?]