Bug Report

Type /ver NametagEdit and post the output.
NametagEdit version 4.4.10

What version of Bukkit/Spigot/PaperSpigot are you using? Type /ver
git-Spigot-db6de12-18fbb24 (MC: 1.8.8)

What plugins are you using? Type /plugins
LobbyVIP, BarAPI, PerWorldPlugins, PlugMan, WandTests, ConsoleSpamFix, DynamicAliases, ServerLinks, ViaVersion, ClickTpa, AsyncWorldEditInjector, TigerReports, LuckPerms, Skript, VipSlot, HideOres, AutoBroadcast, ChatControl, Broadcast, WeatherRestrictions, ActionBarAPI, Fireworks, Multiverse-Core, ProtocolLib, VoidSpawn, DeathMessagesPrime, MessageAuto, StaffHelp, MVdWPlaceholderAPI, VotingPlugin, UberEnchant, CommandExpectation, ProMaintenanceMode, AntiDisconnectSpam, PerPlayerMessage, CleanroomGenerator, ColoredSigns, Lobbys, TerrainControl, PlaceholderAPI, Multiverse-Inventories, EditableSign, PluginGUI, DynamicSigns, DMPPlaceholderAPI, CoreProtect, WorldEdit, OpenInv, FullVanish, ClearLag, ColorMOTD, SkQuery, WorldBorder, SignPlaceholders, BuycraftX, EndlessEnchant, Votifier, Launchpads, AsyncWorldEdit, CoreData, ConditionalCommands, OPLock, AntiAura, AdvancedChatTorch, Vault, MassiveCore, EpicRename, SuperPotions, TreysCommandBlocker, HolographicDisplays, Spartan, AddLight, PlayerVaults, Tablist, MessageFilter, ACubelets, AdvancedBan, InfoBoardReborn, Citizens, MovingDevApi, Shopkeepers, AsyncWorldEdit-ActionBarAPI, Lottery, WorldEditSelectionVisualizer, ChatColor2, KitPvP, WorldGuard, CorePlaytime, skRayFall, PhantomEconomy, TradePlus, MassiveBooks, boosCooldowns, Essentials, CustomJoinMessages, WarpPortals, WhatIsIt, KitAdder, ChopTree3, NoFlyZone, floAuction, SpecializedCrates, EssentialsGeoIP, ServerSigns, CompatNoCheatPlus, RegionFX, ExtraContexts, InSignsPlus, EssentialsChat, EchoPet, ChestShop, Factions, EssentialsProtect, EssentialsAntiBuild, EssentialsSpawn, CombatLogX, SilkSpawners, BossShopPro, WildStacker, DeluxeCombat, DeluxeCombat_Addon_WG, MC2FA, NametagEdit

Please explain your issue. How do you trigger it?
I can an error in console. It happens at random, particularly when someone quits

Are there any errors in the console? Please use: https://pastebin.com
https://pastebin.com/ZzM8ANpz