[22:14:20 WARN]: [MMOItems] Task #2731 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]