mm error

[13:15:35 WARN]: [MythicMobs] Task #525 for MythicMobs v4.7.0-SNAPSHOT generated an exception
java.lang.NullPointerException: null
        at io.lumine.xikage.mythicmobs.players.PlayerManager.lambda$saveAll$107(PlayerManager.java:72) ~[MythicMobs-4.7.0%20(1).jar:?]
        at java.util.concurrent.ConcurrentHashMap$ValuesView.forEach(ConcurrentHashMap.java:4707) ~[?:1.8.0_201]
        at io.lumine.xikage.mythicmobs.players.PlayerManager.saveAll(PlayerManager.java:72) ~[MythicMobs-4.7.0%20(1).jar:?]
        at io.lumine.xikage.mythicmobs.io.ConfigManager.SaveAll(ConfigManager.java:85) ~[MythicMobs-4.7.0%20(1).jar:?]
        at io.lumine.xikage.mythicmobs.clock.MythicMobsClock.executeSave(MythicMobsClock.java:81) ~[MythicMobs-4.7.0%20(1).jar:?]
        at io.lumine.xikage.mythicmobs.clock.MythicMobsClock.run(MythicMobsClock.java:41) ~[MythicMobs-4.7.0%20(1).jar:?]
        at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftTask.run(CraftTask.java:71) ~[spacedev.jar:git-Spigot-3d850ec-809c399]
        at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:353) [spacedev.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:739) [spacedev.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) [spacedev.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) [spacedev.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [spacedev.jar:git-Spigot-3d850ec-809c399]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_201]