mm error reload

[15:43:43 INFO]: Lordinouille issued server command: /mm reload
[15:43:43 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'mm' in plugin MythicMobs v4.7.0-SNAPSHOT
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spacedev.jar:git-Spigot-3d850ec-809c399]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spacedev.jar:git-Spigot-3d850ec-809c399]
        at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:649) ~[spacedev.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.PlayerConnection.handleCommand(PlayerConnection.java:1397) [spacedev.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1232) [spacedev.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) [spacedev.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) [spacedev.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$1.run(SourceFile:13) [spacedev.jar:git-Spigot-3d850ec-809c399]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_201]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_201]
        at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [spacedev.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:748) [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]
Caused by: java.lang.NullPointerException
        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.commands.ReloadCommand.onCommand(ReloadCommand.java:23) ~[MythicMobs-4.7.0%20(1).jar:?]
        at io.lumine.utils.commands.Command.onCommand(Command.java:69) ~[MythicMobs-4.7.0%20(1).jar:?]
        at io.lumine.utils.commands.Command.onCommand(Command.java:60) ~[MythicMobs-4.7.0%20(1).jar:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spacedev.jar:git-Spigot-3d850ec-809c399]
        ... 15 more
[15:43:50 INFO]: [Su