src/de/steamwar/bungeecore/commands/TeamCommand.java

@@ -387,7 +387,7 @@ public class TeamCommand extends BasicCommand {
         }
 
         team.setTeamLeader(target.getId());
-        Message.send("TEAM_LEADER_CHANGED", player, args[0]);
+        Message.send("TEAM_LEADER_CHANGED", player, args[1]);
     }
 
     private String playerName(SteamwarUser user){