graveyards plugin is update, please

i'm using 1.11.2

warn meessage -->

[09:37:53] [Server thread/WARN]: [Graveyards] Task #29 for Graveyards v2.1.8 generated an exception
java.lang.NullPointerException
at net.elseland.xikage.Graveyards.Graveyard.discover(Graveyard.java:206) ~[?:?]
at net.elseland.xikage.Graveyards.Clock.run(Clock.java:13) ~[?:?]
at org.bukkit.craftbukkit.v1_11_R1.scheduler.CraftTask.run(CraftTask.java:71) ~[spigot-1.11.2.jar:git-Spigot-7d78b81-96f03d9]
at...

graveyards plugin is update, please