error spam

[01:50:33 ERROR]: [MythicMobs] [SCHEDULER] Exception thrown whilst executing task
[01:50:33 WARN]: java.lang.NullPointerException
[01:50:33 WARN]:        at io.lumine.xikage.mythicmobs.players.PlayerManager.lambda$saveAll$0(PlayerManager.java:72)
[01:50:33 WARN]:        at java.util.concurrent.ConcurrentHashMap$ValuesView.forEach(ConcurrentHashMap.java:4707)
[01:50:33 WARN]:        at io.lumine.xikage.mythicmobs.players.PlayerManager.saveAll(PlayerManager.java:72)
[01:50:33 WARN]:        at io.lumine.xikage.mythicmobs.io.ConfigManager.SaveAll(ConfigManager.java:85)
[01:50:33 WARN]:        at io.lumine.xikage.mythicmobs.clock.MythicMobsClock.executeSave(MythicMobsClock.java:81)
[01:50:33 WARN]:        at io.lumine.xikage.mythicmobs.clock.MythicMobsClock.run(MythicMobsClock.java:41)
[01:50:33 WARN]:        at io.lumine.utils.tasks.Scheduler$DelegateConsumer.accept(Scheduler.java:533)
[01:50:33 WARN]:        at io.lumine.utils.tasks.Scheduler$TaskImpl.run(Scheduler.java:435)
[01:50:33 WARN]:        at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftTask.run(CraftTask.java:71)
[01:50:33 WARN]:        at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:353)
[01:50:33 WARN]:        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:739)
[01:50:33 WARN]:        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406)
[01:50:33 WARN]:        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679)
[01:50:33 WARN]:        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577)
[01:50:33 WARN]:        at java.lang.Thread.run(Thread.java:748)