Поле account_init может быть пустое?

Здравствуйте, уважаемые знатоки. Не могу добиться решения данной проблемы.

[24-Nov-2019 11:38:37 Europe/Moscow] PHP Fatal error:  Uncaught Error: Call to undefined function account_init() in /home/i55573/public_html/sitemysql.php:146
Stack trace:
#0 /home/i55573/public_html/site/bax_100.php(31): addUser(297991836, 'LoweBowe', '\xD0\x9B\xD0\xBE\xD1\x83')
#1 {main}
  thrown in /home/i55573/public_html/site/mysql.php on line 146

<?php

function getReferal($uid)
{
  $referals = 0;
  
  $pdo = connect();
  if ($pdo)
  {
      $stmt = $pdo->prepare('SELECT * FROM ref WHERE owner = :owner and referals <> :id');
			$stmt->execute(array("owner" => $uid, "id" => $uid));
      $referals = $stmt->rowCount();  
  }
  return $referals;
}


function RefSave($uid, $refs, $first_name, $username)
{
  
  $referals = 0;
  $pdo = connect();
  if ($pdo)
  {
    
      $stmt = $pdo->prepare('SELECT owner FROM ref WHERE referals = ?');
			$stmt->execute([$uid]);
      $referals = $stmt->rowCount();     
      if ($referals == 0)
      {
        $data = array("owner" => $refs,"referals" => $uid,
                      "first_name" => $first_name, "username" => $username,
                        "date_begin" => gmdate("d.m.Y H:i:s", time()+ ( 3 * 60 * 60 )));
        $st = $pdo->prepare("INSERT INTO  ref (owner, referals, first_name, username, date_begin) 
          VALUES(:owner, :referals, :first_name, :username, :date_begin)");
        $st->execute($data);
      }
      $stmt = $pdo->prepare('SELECT referals FROM ref WHERE owner = ?');
			$stmt->execute([$uid]);
      $referals = $stmt->rowCount();  
  }
  return $referals;
}
  

function getUsers($table)
{
  $i = 0;
  $pdo = connect();
		if ($pdo)
		{
		$stmt = $pdo->prepare("SELECT distinct(id) FROM {$table}");
    $stmt->execute();
    foreach ($stmt as $row) {
          $arr[$i] = $row['id'];
          $i ++; 
    }  
    return $arr;
		}
}
  

function connect()
  
{
  $host = 'localhost';
    $db   = 'i55573_db'; // Имя БД
    $user = 'i55573_dbuser';  // Имя пользователя БД
    $pass = 'm6r1a9d63t8z9b'; // Пароль БД
    $charset = 'utf8';
    $dsn = "mysql:host=$host;dbname=$db;charset=$charset";
    $opt = [
        PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
        PDO::ATTR_EMULATE_PREPARES   => false,
    ];
  try {
    $pdo = new PDO($dsn, $user, $pass, $opt);
  
    return $pdo;
} catch (PDOException $e) {
    echo 'Подключение не удалось: ' . $e->getMessage();
    return false;
   // die('Подключение не удалось: ' . $e->getMessage());
}
}



function updateColumns($data,$uid)
{
		$pdo = connect();
    foreach ($data as $key => $value)
    {      
			
      if ($value!=null && $value!="null" && $value!="")
      {
      
        $val = array(
          "value" => $value,
          "uid" => $uid          
        );
				$st = $pdo->prepare("UPDATE users  set {$key} = :value where id = :uid;");
				$st->execute($val);				 
      }
    }
	return true;
}



function MessageSave($data)
{
		$pdo = connect();
		if ($pdo)
		{

			$st = $pdo->prepare("INSERT INTO  messages (user_id, username, first_name, message_id, text, date,ndate)
				VALUES (:user_id, :username, :first_name, :message_id, :text, :date, :ndate)");
			$st->execute($data);				 

			return true;
			
		}
	else{ return false;}
}

function addUser($uid,$username,$first_name)
{
	  
		$pdo = connect();
		if ($pdo)
		{
			
			//users
			$stmt = $pdo->prepare('SELECT id FROM users WHERE id = ?');
			$stmt->execute([$uid]);

			if ($stmt->rowCount() == 0) // юзера нет - пишем
			{
		
					$data = array("id" => $uid,"username" => $username,"first_name" => $first_name,
                        "date_begin" => gmdate("d.m.Y H:i:s", time()+ ( 3 * 60 * 60 )));
					$st = $pdo->prepare("INSERT INTO  users (id, username, first_name,status, date_begin) VALUES(:id, :username, :first_name,0, :date_begin)");
					$st->execute($data);
          account_init($uid);// Инициализация баланса
			}
		} 
}

function userget($uid)
{
	$pdo = connect();
		if ($pdo)
		{
			$stmt = $pdo->prepare('SELECT username, first_name, status FROM users WHERE id = ?');
			$stmt->execute([$uid]);
			$stat = [];
			foreach ($stmt as $row)
				{
						$stat['username'] = $row['username'];
						$stat['first_name'] = $row['first_name'];
						$stat['status'] = $row['status'];
				}
			return $stat;
		}
	return false;
}
?>

<?php
ini_set('log_errors', 'On');
ini_set('error_log', 'php_errors.log');

include('function.php');
include('mysql.php');
include('config.php');

if (($json = valid()) == false) {exit();}
  
  $uid = $json['message']['from']['id'];         
  $first_name = $json['message']['from']['first_name'];
  $username = $json['message']['from']['username'];
  $date = $json['message']["date"];
  $msgid = $json['message']['message_id'];
  $text = $json['message']['text'];
  
$message_array = array(
    "user_id" => $uid,
    "username" => $username, 
    "first_name" => $first_name, 
    "message_id" => $msgid, 
    "text" => $text, 
    "date" => $date,
    "ndate" =>  gmdate("d.m.Y H:i:s", $date)
  ); 

////////////// add user, save message //////////////////

  MessageSave($message_array);  
  addUser($uid, $username,  $first_name);  // Добавить юзера в бд


$hello = "\n_команда не определена...попробуй _ /start ";

///////////// referal init /////////////////////////////
$ref = parseReferal($text);  // извлечение ref
if ($ref) {RefSave($uid,$ref, $first_name, $username); 
} // сохраняем реф
/////////////////////////////////////////////////////////
$referals = getReferal($uid);




switch ($text) {

    case '/start':
        $hello = "Привлеки двух юзеров и получи приватный линк";
        break;
    case "Получить линк":
        if ($referals < 2) {
        $hello = 
"Чтобы получить приватный линк, необходимо, чтобы по ваше ссылке перешло *всего 2 человека*.\n
Привлечено: ".$referals."\n
Ваша реферальная ссылка:\nt.me/".$BOT_USERNAME."?start=".$uid;  
          
        }
      else {$hello = 'http://google.com';}
    break;
    
  case "Рефералы":
        $hello = "\nПривлечено рефералов: ".$referals;
  break;

}

$keyboard = keyboard("menu");
sendMessage($uid,$hello, $keyboard);


?>

Я чайник, прошу сильно не пинаться. Что я не так сделал, помогите разобраться пожалуйста.