[Glint]

What about now

pawn Код:

enum fInfo
{
    Furnitures,
    Furniture[100],
    FurnitureName[100] 
} // line 698

new fur[MAX_PLAYERS][fInfo];

new string[256];

    if(strcmp(cmd, "/command", true) == 0)
    {
        new s[20][MAX_PLAYER_NAME];
        for(new f = 0; f < 20; f++)
        {
            if(fur[playerid][Furniture][f] == 0)
            {
                format(s[f],sizeof(s[f]),"Free slot!");
            }
            else 
            { 
                format(s[f],sizeof(s[f]),"%s",fur[playerid][FurnitureName][f]);
            }
            strcat(string, s[f], sizeof(s[f]));
        }
        ShowPlayerDialog(playerid,28,DIALOG_STYLE_LIST,"Furnitures:",string,"Select","Exit");
        return 1;
    }

Tell me if it works or not.