Scoreboard Error?

[01:02:29] [Server thread/WARN]: [Scoreboard] Task #1638 for Scoreboard v1.4 generated an exception
java.lang.NullPointerException
        at com.github.rienbijl.Scoreboard.board.Board$3.run(Board.java:186) ~[?:?]
        at org.bukkit.craftbukkit.v1_11_R1.scheduler.CraftTask.run(CraftTask.java:71) ~[spigot.jar:git-Spigot-d4f98a3-cb61ac0]
        at org.bukkit.craftbukkit.v1_11_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:353) [spigot.jar:git-Spigot-d4f98a3-cb61ac0]
        at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:738) [spigot.jar:git-Spigot-d4f98a3-cb61ac0]
        at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:399) [spigot.jar:git-Spigot-d4f98a3-cb61ac0]
        at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:678) [spigot.jar:git-Spigot-d4f98a3-cb61ac0]
        at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:576) [spigot.jar:git-Spigot-d4f98a3-cb61ac0]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_121]