NoCheatPlus: ConcurrentModificationException in recalculatePermissions

[ghost]

Plugin : NoCheatPlus.

Error:

18:28:08 [INFO] [Pokkit] [NoCheatPlus] Added hook: AllViolations(NCP) [1.0].
18:28:08 [ERROR] [Pokkit] [NoCheatPlus] Failed to complement permissions: ConcurrentModificationException
18:28:08 [ERROR] [Pokkit] [NoCheatPlus] java.util.ConcurrentModificationException
java.util.HashMap$HashIterator.nextNode(HashMap.java:1437)
java.util.HashMap$ValueIterator.next(HashMap.java:1466)
cn.nukkit.permission.PermissibleBase.recalculatePermissions(PermissibleBase.java:133)
cn.nukkit.command.ConsoleCommandSender.recalculatePermissions(ConsoleCommandSender.java:68)
nl.rutgerkok.pokkit.command.PokkitCommandSender.recalculatePermissions(PokkitCommandSender.java:114)
org.bukkit.permissions.Permission.recalculatePermissibles(Permission.java:168)
org.bukkit.permissions.Permission.addParent(Permission.java:206)
fr.neatmonster.nocheatplus.permissions.PermissionUtil.addChildPermission(PermissionUtil.java:197)
fr.neatmonster.nocheatplus.NoCheatPlus.postEnable(NoCheatPlus.java:976)
fr.neatmonster.nocheatplus.NoCheatPlus$PostEnableTask.run(NoCheatPlus.java:230)
cn.nukkit.scheduler.TaskHandler.run(TaskHandler.java:99)
cn.nukkit.scheduler.ServerScheduler.mainThreadHeartbeat(ServerScheduler.java:204)
cn.nukkit.Server.tick(Server.java:997)
cn.nukkit.Server.tickProcessor(Server.java:786)
cn.nukkit.Server.start(Server.java:765)
cn.nukkit.Server.(Server.java:456)
cn.nukkit.Nukkit.main(Nukkit.java:65)

18:28:08 [ALERT] java.lang.RuntimeException: java.util.ConcurrentModificationException
at cn.nukkit.plugin.PluginManager.enablePlugin(PluginManager.java:460)
at cn.nukkit.Server.enablePlugin(Server.java:618)
at cn.nukkit.Server.enablePlugins(Server.java:607)
at cn.nukkit.Server.reload(Server.java:677)
at cn.nukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:27)
at cn.nukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:225)
at cn.nukkit.Server.dispatchCommand(Server.java:630)
at cn.nukkit.command.CommandReader.run(CommandReader.java:70)
Caused by: java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1437)
at java.util.HashMap$ValueIterator.next(HashMap.java:1466)
at cn.nukkit.permission.PermissibleBase.recalculatePermissions(PermissibleBase.java:133)
at cn.nukkit.command.ConsoleCommandSender.recalculatePermissions(ConsoleCommandSender.java:68)
at cn.nukkit.plugin.PluginManager.dirtyPermissibles(PluginManager.java:376)
at cn.nukkit.plugin.PluginManager.calculatePermissionDefault(PluginManager.java:364)
at cn.nukkit.plugin.PluginManager.addPermission(PluginManager.java:328)
at cn.nukkit.plugin.PluginManager.enablePlugin(PluginManager.java:454)
... 7 more