Prevent GM commands from being used on CommandBlocks.

EssentialsGroupManager/src/Changelog.txt

@@ -203,3 +203,4 @@ v 2.0:
 	- Add alphabetically sorted user lists.
 	- allWorldsDataList now returns fully mirrored worlds which are not identical mirrors (fixes the /manselect list).
 	- Add support for Rcon.
+	- Prevent GM commands from being used on CommandBlocks.

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

@@ -382,6 +382,12 @@ public class GroupManager extends JavaPlugin {
 		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) {
 			senderPlayer = (Player) sender;