2 files changed, 8 insertions, 5 deletions
diff --git a/src/main/java/org/bukkit/command/Command.java b/src/main/java/org/bukkit/command/Command.java
index 5416c71d..a04c8701 100644
--- a/src/main/java/org/bukkit/command/Command.java
+++ b/src/main/java/org/bukkit/command/Command.java
@@ -78,18 +78,18 @@ public abstract class Command {
         Validate.notNull(args, "Arguments cannot be null");
         Validate.notNull(alias, "Alias cannot be null");
 
-        if (!(sender instanceof Player) || args.length == 0) {
+        if (args.length == 0) {
             return ImmutableList.of();
         }
 
         String lastWord = args[args.length - 1];
 
-        Player senderPlayer = (Player) sender;
+        Player senderPlayer = sender instanceof Player ? (Player) sender : null;
 
         ArrayList<String> matchedPlayers = new ArrayList<String>();
         for (Player player : sender.getServer().getOnlinePlayers()) {
             String name = player.getName();
-            if (senderPlayer.canSee(player) && StringUtil.startsWithIgnoreCase(name, lastWord)) {
+            if ((senderPlayer == null || senderPlayer.canSee(player)) && StringUtil.startsWithIgnoreCase(name, lastWord)) {
                 matchedPlayers.add(name);
             }
         }
diff --git a/src/main/java/org/bukkit/command/SimpleCommandMap.java b/src/main/java/org/bukkit/command/SimpleCommandMap.java
index f567dc0e..f7167824 100644
--- a/src/main/java/org/bukkit/command/SimpleCommandMap.java
+++ b/src/main/java/org/bukkit/command/SimpleCommandMap.java
@@ -16,6 +16,7 @@ import java.util.regex.Pattern;
 import org.apache.commons.lang.Validate;
 import org.bukkit.Server;
 import org.bukkit.command.defaults.*;
+import org.bukkit.entity.Player;
 import org.bukkit.util.StringUtil;
 
 public class SimpleCommandMap implements CommandMap {
@@ -226,6 +227,8 @@ public class SimpleCommandMap implements CommandMap {
             ArrayList<String> completions = new ArrayList<String>();
             Map<String, Command> knownCommands = this.knownCommands;
 
+            final String prefix = (sender instanceof Player ? "/" : "");
+
             for (VanillaCommand command : fallbackCommands) {
                 String name = command.getName();
 
@@ -241,7 +244,7 @@ public class SimpleCommandMap implements CommandMap {
                     continue;
                 }
 
-                completions.add('/' + name);
+                completions.add(prefix + name);
             }
 
             for (Map.Entry<String, Command> commandEntry : knownCommands.entrySet()) {
@@ -254,7 +257,7 @@ public class SimpleCommandMap implements CommandMap {
                 String name = commandEntry.getKey(); // Use the alias, not command name
 
                 if (StringUtil.startsWithIgnoreCase(name, cmdLine)) {
-                    completions.add('/' + name);
+                    completions.add(prefix + name);
                 }
             }