Problem/Bug [Server] FATAL Error executing task

Hey guys,

I got a problem with my Craftbukkit-Server 1.9 ! Everything works fine using multicraft, except this:

Console (open) Console (close)

03.03 16:28:04 [Server] FATAL Error executing task
03.03 16:28:04 [Server] INFO java.util.concurrent.ExecutionException: java.lang.ArrayIndexOutOfBoundsException
03.03 16:28:04 [Server] INFO at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_65]
03.03 16:28:04 [Server] INFO at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_65]
03.03 16:28:04 [Server] INFO at net.minecraft.server.v1_9_R1.SystemUtils.a(SourceFile:46) [craftbukkit_server.jar:git-Bukkit-c194444]
03.03 16:28:04 [Server] INFO at net.minecraft.server.v1_9_R1.MinecraftServer.D(MinecraftServer.java:674) [craftbukkit_server.jar:git-Bukkit-c194444]
03.03 16:28:04 [Server] INFO at net.minecraft.server.v1_9_R1.DedicatedServer.D(DedicatedServer.java:361) [craftbukkit_server.jar:git-Bukkit-c194444]
03.03 16:28:04 [Server] INFO at net.minecraft.server.v1_9_R1.MinecraftServer.C(MinecraftServer.java:630) [craftbukkit_server.jar:git-Bukkit-c194444]
03.03 16:28:04 [Server] INFO at net.minecraft.server.v1_9_R1.MinecraftServer.run(MinecraftServer.java:534) [craftbukkit_server.jar:git-Bukkit-c194444]
03.03 16:28:04 [Server] INFO at java.lang.Thread.run(Unknown Source) [?:1.8.0_65]
03.03 16:28:04 [Server] INFO Caused by: java.lang.ArrayIndexOutOfBoundsException

The server is not shutting down, still running, but time by time I got this FATAL Error and dont know why :/

DONE, just dont use Multicraft !

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

I have the same problem with spigot 1.9.
The error hapend wen i try to right clic a PNJ. Of curs right clic don't work.
Thank for helping.