[23:12:13 WARN]: [CivCraft] Task #55 for CivCraft v1.0.0 generated an exception
java.util.NoSuchElementException: null
        at java.util.HashMap$HashIterator.nextNode(Unknown Source) ~[?:1.8.0_201]
        at java.util.HashMap$KeyIterator.next(Unknown Source) ~[?:1.8.0_201]
        at com.avrgaming.civcraft.pvplogger.PvPLogger.purgeExpired(PvPLogger.java:97) ~[?:?]
        at com.avrgaming.civcraft.main.CivCraft.lambda$onEnable$2(CivCraft.java:292) ~[?:?]
        at org.bukkit.craftbukkit.v1_13_R2.scheduler.CraftTask.run(CraftTask.java:81) ~[spigot.jar:git-Spigot-518206a-a5b9c7b]
        at org.bukkit.craftbukkit.v1_13_R2.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:391) [spigot.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.MinecraftServer.b(MinecraftServer.java:888) [spigot.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:417) [spigot.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:830) [spigot.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:728) [spigot.jar:git-Spigot-518206a-a5b9c7b]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_201]