Holographic Graves console error log

[18:50:42] [Server thread/INFO]: Clare_87 was blown up by Creeper
[18:51:13] [Server thread/INFO]: Clare_87 lost connection: Timed out

(...)

[19:03:19] [User Authenticator #14/INFO]: UUID of player Clare_87 is 507dffc0-3558-4314-aee3-90ce215f6760
[19:03:20] [Server thread/INFO]: Clare_87[/83.89.48.62:33080] logged in with entity id 25804 at ([newvanilla] 601.6999999880791, 11.0, -456.30000001192093)
[19:03:20] [Craft Scheduler Thread - 73/INFO]: [GAListener] Player: Clare_87 has 0 votes
[19:03:20] [Server thread/INFO]: [PlayerSnapshot]: Created snapshot (login-20141112.070319-2d) for Clare_87.
[19:03:20] [Thread-82/ERROR]: Could not pass event PlayerDeathEvent to Graves v9.0
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:509) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:494) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at org.bukkit.craftbukkit.v1_7_R4.event.CraftEventFactory.callPlayerDeathEvent(CraftEventFactory.java:397) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at net.minecraft.server.v1_7_R4.EntityPlayer.die(EntityPlayer.java:386) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at org.bukkit.craftbukkit.v1_7_R4.entity.CraftLivingEntity.setHealth(CraftLivingEntity.java:85) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at com.mengcraft.server.PlayerSQL$PlayerListener$LoadPlayerTask.loadPlayer(PlayerSQL.java:233) [PlayerSQL-1.5.1.jar:?]
	at com.mengcraft.server.PlayerSQL$PlayerListener$LoadPlayerTask.run(PlayerSQL.java:174) [PlayerSQL-1.5.1.jar:?]
	at java.lang.Thread.run(Thread.java:745) [?:1.7.0_72]
Caused by: java.lang.IllegalStateException: Asynchronous entity add!
	at org.spigotmc.AsyncCatcher.catchOp(AsyncCatcher.java:14) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at net.minecraft.server.v1_7_R4.World.addEntity(World.java:1070) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at com.gmail.filoghost.holograms.nms.v1_7_R4.NmsManagerImpl.spawnCustomItem(NmsManagerImpl.java:80) ~[?:?]
	at com.gmail.filoghost.holograms.object.pieces.FloatingItemDoubleEntity.spawn(FloatingItemDoubleEntity.java:31) ~[?:?]
	at com.gmail.filoghost.holograms.object.CraftFloatingItem.forceUpdate(CraftFloatingItem.java:117) ~[?:?]
	at com.gmail.filoghost.holograms.object.CraftFloatingItem.update(CraftFloatingItem.java:99) ~[?:?]
	at com.gmail.filoghost.holograms.api.HolographicDisplaysAPI.createFloatingItem(HolographicDisplaysAPI.java:69) ~[?:?]
	at me.flamboo.graves.Graves.onPlayerDeath(Graves.java:102) ~[?:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_72]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_72]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_72]
	at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_72]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:298) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	... 9 more
[19:03:20] [Thread-82/INFO]: Clare_87 died