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via GitHub by NorthWestTrees
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java.lang.NullPointerException at net.milkbowl.vault.chat.plugins.Chat_GroupManager.getPlayerPrefix(Chat_GroupManager.java:271)[Vault.jar:?] at net.milkbowl.vault.chat.Chat.getPlayerPrefix(Chat.java:67)[Vault.jar:?] at net.milkbowl.vault.chat.Chat.getPlayerPrefix(Chat.java:91)[Vault.jar:?] at com.earth2me.essentials.perm.impl.AbstractVaultHandler.getPrefix(AbstractVaultHandler.java:48)[EssentialsX.jar:?] at com.earth2me.essentials.perm.PermissionsHandler.getPrefix(PermissionsHandler.java:68)[EssentialsX.jar:?] at com.earth2me.essentials.User.getNick(User.java:310)[EssentialsX.jar:?] at com.earth2me.essentials.User.getNick(User.java:279)[EssentialsX.jar:?] at com.earth2me.essentials.User.setDisplayNick(User.java:339)[EssentialsX.jar:?] at com.earth2me.essentials.User.checkActivity(User.java:584)[EssentialsX.jar:?] at com.earth2me.essentials.EssentialsTimer.run(EssentialsTimer.java:58)[EssentialsX.jar:?] at org.bukkit.craftbukkit.v1_11_R1.scheduler.CraftTask.run(CraftTask.java:53)[craftbukkit-1.11.2.jar:git-Bukkit-775f1e1] at org.bukkit.craftbukkit.v1_11_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:352)[craftbukkit-1.11.2.jar:git-Bukkit-775f1e1] at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:689)[craftbukkit-1.11.2.jar:git-Bukkit-775f1e1] at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:360)[craftbukkit-1.11.2.jar:git-Bukkit-775f1e1] at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:650)[craftbukkit-1.11.2.jar:git-Bukkit-775f1e1] at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:554)[craftbukkit-1.11.2.jar:git-Bukkit-775f1e1] at java.lang.Thread.run(Unknown Source)[?:1.8.0_111]