[21:29:42] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'ps' in plugin ProtectionStones v1.9j
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[craftbukkit.jar:git-Spigot-952179b-bc03b6f]
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[craftbukkit.jar:git-Spigot-952179b-bc03b6f]
	at org.bukkit.craftbukkit.v1_8_R1.CraftServer.dispatchCommand(CraftServer.java:646) ~[craftbukkit.jar:git-Spigot-952179b-bc03b6f]
	at net.minecraft.server.v1_8_R1.PlayerConnection.handleCommand(PlayerConnection.java:1115) [craftbukkit.jar:git-Spigot-952179b-bc03b6f]
	at net.minecraft.server.v1_8_R1.PlayerConnection.a(PlayerConnection.java:950) [craftbukkit.jar:git-Spigot-952179b-bc03b6f]
	at net.minecraft.server.v1_8_R1.PacketPlayInChat.a(PacketPlayInChat.java:26) [craftbukkit.jar:git-Spigot-952179b-bc03b6f]
	at net.minecraft.server.v1_8_R1.PacketPlayInChat.a(PacketPlayInChat.java:53) [craftbukkit.jar:git-Spigot-952179b-bc03b6f]
	at net.minecraft.server.v1_8_R1.PacketHandleTask.run(SourceFile:13) [craftbukkit.jar:git-Spigot-952179b-bc03b6f]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.7.0_71]
	at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.7.0_71]
	at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:683) [craftbukkit.jar:git-Spigot-952179b-bc03b6f]
	at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:316) [craftbukkit.jar:git-Spigot-952179b-bc03b6f]
	at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:623) [craftbukkit.jar:git-Spigot-952179b-bc03b6f]
	at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:526) [craftbukkit.jar:git-Spigot-952179b-bc03b6f]
	at java.lang.Thread.run(Unknown Source) [?:1.7.0_71]
Caused by: java.lang.NullPointerException
	at java.util.concurrent.ConcurrentHashMap.put(Unknown Source) ~[?:1.7.0_71]
	at java.util.concurrent.ConcurrentHashMap.putAll(Unknown Source) ~[?:1.7.0_71]
	at java.util.concurrent.ConcurrentHashMap.<init>(Unknown Source) ~[?:1.7.0_71]
	at com.sk89q.worldguard.protection.regions.ProtectedRegion.setFlags(ProtectedRegion.java:472) ~[?:?]
	at com.axeldios.ProtectionStones.ProtectionStones.onCommand(ProtectionStones.java:1296) ~[?:?]
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[craftbukkit.jar:git-Spigot-952179b-bc03b6f]
	... 14 more