15.04 15:27:21 [Server] WARN Unexpected exception while parsing console command "back"
15.04 15:27:21 [Server] INFO org.bukkit.command.CommandException: Unhandled exception executing command 'back' in plugin Essentials v2.13.1
15.04 15:27:21 [Server] INFO at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot_1.9.2.jar:git-Spigot-1480adb-6e527e5]
15.04 15:27:21 [Server] INFO at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot_1.9.2.jar:git-Spigot-1480adb-6e527e5]
15.04 15:27:21 [Server] INFO at org.bukkit.craftbukkit.v1_9_R1.CraftServer.dispatchCommand(CraftServer.java:645) ~[spigot_1.9.2.jar:git-Spigot-1480adb-6e527e5]
15.04 15:27:21 [Server] INFO at org.bukkit.craftbukkit.v1_9_R1.CraftServer.dispatchServerCommand(CraftServer.java:631) [spigot_1.9.2.jar:git-Spigot-1480adb-6e527e5]
15.04 15:27:21 [Server] INFO at net.minecraft.server.v1_9_R1.DedicatedServer.aL(DedicatedServer.java:438) [spigot_1.9.2.jar:git-Spigot-1480adb-6e527e5]
15.04 15:27:21 [Server] INFO at net.minecraft.server.v1_9_R1.DedicatedServer.D(DedicatedServer.java:401) [spigot_1.9.2.jar:git-Spigot-1480adb-6e527e5]
15.04 15:27:21 [Server] INFO at net.minecraft.server.v1_9_R1.MinecraftServer.C(MinecraftServer.java:660) [spigot_1.9.2.jar:git-Spigot-1480adb-6e527e5]
15.04 15:27:21 [Server] INFO at net.minecraft.server.v1_9_R1.MinecraftServer.run(MinecraftServer.java:559) [spigot_1.9.2.jar:git-Spigot-1480adb-6e527e5]
15.04 15:27:21 [Server] INFO at java.lang.Thread.run(Unknown Source) [?:1.7.0_51]
15.04 15:27:21 [Server] INFO Caused by: java.lang.NullPointerException
15.04 15:27:21 [Server] INFO at com.earth2me.essentials.Essentials.onCommandEssentials(Essentials.java:389) ~[?:?]
15.04 15:27:21 [Server] INFO at com.earth2me.essentials.Essentials.onCommand(Essentials.java:380) ~[?:?]
15.04 15:27:21 [Server] INFO at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot_1.9.2.jar:git-Spigot-1480adb-6e527e5]
15.04 15:27:21 [Server] INFO ... 8 more