[16:43:36 WARN]: [MMOItems] Task #2953 for MMOItems v4.3 generated an exception
java.lang.IllegalArgumentException: Empty string not allowed
        at net.minecraft.server.v1_9_R2.NBTTagString.<init>(SourceFile:23) ~[BlockSurvi1.9.4.jar:git-Spigot-c6871e2-0cd0397]
        at net.minecraft.server.v1_9_R2.NBTTagCompound.setString(SourceFile:134) ~[BlockSurvi1.9.4.jar:git-Spigot-c6871e2-0cd0397]
        at net.Indyuce.mmoitems.version.nms.NMSHandler_1_9_R2.saveAttributes(NMSHandler_1_9_R2.java:198) ~[MMOItems%20Legacy.jar:?]
        at net.Indyuce.mmoitems.api.PlayerData.updateInventory(PlayerData.java:140) ~[MMOItems%20Legacy.jar:?]
        at net.Indyuce.mmoitems.api.PlayerData.checkForInventoryUpdate(PlayerData.java:110) ~[MMOItems%20Legacy.jar:?]
        at net.Indyuce.mmoitems.MMOItems$1.run(MMOItems.java:162) ~[MMOItems%20Legacy.jar:?]
        at org.bukkit.craftbukkit.v1_9_R2.scheduler.CraftTask.run(CraftTask.java:71) ~[BlockSurvi1.9.4.jar:git-Spigot-c6871e2-0cd0397]
        at org.bukkit.craftbukkit.v1_9_R2.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [BlockSurvi1.9.4.jar:git-Spigot-c6871e2-0cd0397]
        at net.minecraft.server.v1_9_R2.MinecraftServer.D(MinecraftServer.java:734) [BlockSurvi1.9.4.jar:git-Spigot-c6871e2-0cd0397]
        at net.minecraft.server.v1_9_R2.DedicatedServer.D(DedicatedServer.java:399) [BlockSurvi1.9.4.jar:git-Spigot-c6871e2-0cd0397]
        at net.minecraft.server.v1_9_R2.MinecraftServer.C(MinecraftServer.java:665) [BlockSurvi1.9.4.jar:git-Spigot-c6871e2-0cd0397]
        at net.minecraft.server.v1_9_R2.MinecraftServer.run(MinecraftServer.java:564) [BlockSurvi1.9.4.jar:git-Spigot-c6871e2-0cd0397]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_191]
[16:43:37 WARN]: java.io.NotSerializableException: net.minecraft.server.v1_9_R2.NBTTagCompound
[16:43:37 WARN]:        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1184)
[16:43:37 WARN]:        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
[16:43:37 WARN]:        at net.Indyuce.mmoitems.version.nms.NMSHandler_1_9_R2.serialize(NMSHandler_1_9_R2.java:231)
[16:43:37 WARN]:        at net.Indyuce.mmoitems.version.nms.NMSHandler_1_9_R2.saveAttributes(NMSHandler_1_9_R2.java:198)
[16:43:37 WARN]:        at net.Indyuce.mmoitems.api.PlayerData.updateInventory(PlayerData.java:140)
[16:43:37 WARN]:        at net.Indyuce.mmoitems.api.PlayerData.checkForInventoryUpdate(PlayerData.java:110)
[16:43:37 WARN]:        at net.Indyuce.mmoitems.MMOItems$1.run(MMOItems.java:162)
[16:43:37 WARN]:        at org.bukkit.craftbukkit.v1_9_R2.scheduler.CraftTask.run(CraftTask.java:71)
[16:43:37 WARN]:        at org.bukkit.craftbukkit.v1_9_R2.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350)
[16:43:37 WARN]:        at net.minecraft.server.v1_9_R2.MinecraftServer.D(MinecraftServer.java:734)
[16:43:37 WARN]:        at net.minecraft.server.v1_9_R2.DedicatedServer.D(DedicatedServer.java:399)
[16:43:37 WARN]:        at net.minecraft.server.v1_9_R2.MinecraftServer.C(MinecraftServer.java:665)
[16:43:37 WARN]:        at net.minecraft.server.v1_9_R2.MinecraftServer.run(MinecraftServer.java:564)
[16:43:37 WARN]:        at java.lang.Thread.run(Thread.java:748)
[16:43:37 WARN]: [MMOItems] Task #2953 for MMOItems v4.3 generated an exception
java.lang.IllegalArgumentException: Empty string not allowed
        at net.minecraft.server.v1_9_R2.NBTTagString.<init>(SourceFile:23) ~[BlockSurvi1.9.4.jar:git-Spigot-c6871e2-0cd0397]
        at net.minecraft.server.v1_9_R2.NBTTagCompound.setString(SourceFile:134) ~[BlockSurvi1.9.4.jar:git-Spigot-c6871e2-0cd0397]
        at net.Indyuce.mmoitems.version.nms.NMSHandler_1_9_R2.saveAttributes(NMSHandler_1_9_R2.java:198) ~[MMOItems%20Legacy.jar:?]
        at net.Indyuce.mmoitems.api.PlayerData.updateInventory(PlayerData.java:140) ~[MMOItems%20Legacy.jar:?]
        at net.Indyuce.mmoitems.api.PlayerData.checkForInventoryUpdate(PlayerData.java:110) ~[MMOItems%20Legacy.jar:?]
        at net.Indyuce.mmoitems.MMOItems$1.run(MMOItems.java:162) ~[MMOItems%20Legacy.jar:?]
        at org.bukkit.craftbukkit.v1_9_R2.scheduler.CraftTask.run(CraftTask.java:71) ~[BlockSurvi1.9.4.jar:git-Spigot-c6871e2-0cd0397]
        at org.bukkit.craftbukkit.v1_9_R2.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [BlockSurvi1.9.4.jar:git-Spigot-c6871e2-0cd0397]
        at net.minecraft.server.v1_9_R2.MinecraftServer.D(MinecraftServer.java:734) [BlockSurvi1.9.4.jar:git-Spigot-c6871e2-0cd0397]
        at net.minecraft.server.v1_9_R2.DedicatedServer.D(DedicatedServer.java:399) [BlockSurvi1.9.4.jar:git-Spigot-c6871e2-0cd0397]
        at net.minecraft.server.v1_9_R2.MinecraftServer.C(MinecraftServer.java:665) [BlockSurvi1.9.4.jar:git-Spigot-c6871e2-0cd0397]
        at net.minecraft.server.v1_9_R2.MinecraftServer.run(MinecraftServer.java:564) [BlockSurvi1.9.4.jar:git-Spigot-c6871e2-0cd0397]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_191]