Trouble adding players to teams

I'm trying to create commands that will give players a glow around their character with a command + color argument, because I want the players to be able to choose their glow color. I found that the easiest way to do that is to add the player to a color-coded team. My only problem is that I don't know how to do this without duplicating the team (& getting an error because the team already exists). Now, the command only works on the first try - any other attempts gives me an error unless I remove the team with the /team remove command.

(Please ignore my messy code)

How would I create teams so that my code doesn't try to create the same team every time the specific color command is run? All I want is /teamglow red to make the player glow red, /teamglow blue for blue, etc.

Teams.java class

Code:

    public void teamList(Player player, String color) {
      
        ScoreboardManager manager = Bukkit.getScoreboardManager();
        Scoreboard board = manager.getMainScoreboard();
        Team red = board.registerNewTeam("Red");
        Team yellow = board.registerNewTeam("Yellow");
        Team pink = board.registerNewTeam("Pink");
        Team blue = board.registerNewTeam("Blue");
        red.setColor(ChatColor.RED);
        yellow.setColor(ChatColor.YELLOW);
        pink.setColor(ChatColor.DARK_AQUA); // not pink I know
        blue.setColor(ChatColor.BLUE);
      
        if (color.equalsIgnoreCase("red")) {
            red.addEntry(player.getName());
            player.sendMessage("RED!");

        }
        else if (color.equalsIgnoreCase("blue")) {

            blue.addEntry(player.getName());
            player.sendMessage("BLUE!");
            //return blue;

        }
        else if (color.equalsIgnoreCase("yellow")) {
            yellow.addEntry(player.getName());
            player.sendMessage("YELLOW!");
            //return yellow;
        }
      
        else if (color.equalsIgnoreCase("pink")) {
            pink.addEntry(player.getName());
            player.sendMessage("PINK!");
            //return pink;
        }
        //return null;
   
    }

Command code:

Code:

            if (cmd.getName().equalsIgnoreCase(cmd4)) {

                if (args.length == 0) {
                    player.sendMessage(ChatColor.ITALIC + "Correct format: /teamglow [color]");
                  
                }
                else {
                  
                    Teams glow = new Teams();
                    glow.teamList(player, args[0]);
                    //teamType.addEntry(player.getName());
                    //System.out.println("Hello!!!" + teamType.toString());
                    player.sendMessage("This works!");
                }
              
                return true;
            }

 

You could try making a list and appending to it.