Prevent GM commands from being used on CommandBlocks.

EssentialsGroupManager/src/Changelog.txt

@@ -202,4 +202,5 @@ v 2.0:
 	- Change order of data in Users.yml to [name, Group, SubGroup, Permissions, Info nodes].
 	- Add alphabetically sorted user lists.
 	- allWorldsDataList now returns fully mirrored worlds which are not identical mirrors (fixes the /manselect list).
-	- Add support for Rcon.
+	- Add support for Rcon.
+	- Prevent GM commands from being used on CommandBlocks.

EssentialsGroupManager/src/org/anjocaido/groupmanager/GroupManager.java

@@ -381,6 +381,12 @@ public class GroupManager extends JavaPlugin {
 		Group senderGroup = null;
 		User senderUser = null;
 		boolean isOpOverride = config.isOpOverride();
+		
+		// PREVENT GM COMMANDS BEING USED ON COMMANDBLOCKS
+		if (sender.getClass().getName().equals("org.bukkit.command.BlockCommandSender")) {
+			sender.sendMessage(ChatColor.RED + "GM Commands can not be called from CommandBlocks");
+		  	return true;
+		}
 
 		// DETERMINING PLAYER INFORMATION
 		if (sender instanceof Player) {