"Uncaught PDOException: SQLSTATE[HY000]" When Trying to Insert [PHP 8.0] - php

Question

So my code was working perfectly fine, until I tried to insert to the database..
my DB.php (The problem seems to be here, I checked all the other files and nothing is causing any problems, the function I used was the Insert function and I got an error on line 37:
<?php
class DB
{
private static $_instance = null;
private $_pdo,
$_query,
$_error = false,
$_result,
$_count = 0;
private function __construct()
{
try {
$this->_pdo = new PDO('mysql:host=' . Config::get('mysql/host') . ';dbname=' . Config::get('mysql/db') . '', Config::get('mysql/username'), Config::get('mysql/password'));
} catch (PDOException $e) {
die($e->getMessage());
}
}
public static function getInstance()
{
if (!isset(self::$_instance)) {
self::$_instance = new DB();
}
return self::$_instance;
}
public function query($sql, $params = array())
{
$this->_error = false;
if ($this->_query = $this->_pdo->prepare($sql)) {
$x = 1;
if (count($params)) {
foreach ($params as $param) {
$this->_query->bindValue($x, $param);
$x++;
}
}
if ($this->_query->execute()) {
$this->_results = $this->_query->fetchAll(PDO::FETCH_OBJ);
$this->_count = $this->_query->rowCount();
} else {
$this->_error = true;
}
}
return $this;
}
public function action($action, $table, $where = array())
{
if (count($where) == 3) {
$operators = array('=', '>', '<', '>=', '<=');
$field = $where[0];
$operator = $where[1];
$value = $where[2];
if (in_array($operator, $operators)) {
$sql = "{$action} FROM {$table} WHERE {$field} {$operator} ?";
if ($this->query($sql, array($value))) {
return $this;
}
}
}
return false;
}
public function get($table, $where)
{
return $this->action('SELECT *', $table, $where);
}
public function delete($table, $where)
{
return $this->action('DELETE *', $table, $where);
}
public function error()
{
return $this->_error;
}
public function count()
{
return $this->_count;
}
public function insert($table, $fields = array())
{
if (count($fields)) {
$keys = array_keys($fields);
$values = '';
$x = 1;
foreach($fields as $field){
$values .= "?";
if($x < count($fields)){
$values .= ', ';
}
$x++;
}
$sql = "INSERT INTO users (`" . implode('`,`', $keys) . "`) VALUES ({$values})";
echo $sql;
if(!$this->query($sql, $fields)->error()){ //where my error occurred
return true;
}
}
return false;
}
}
(The data's inserted to the table but that error seems crucial and I didn't find anything about it anywhere)
I watched a tutorial on YouTube and the problem occurred here- https://youtu.be/zvXgsouIzVg?t=5258
(The full error):
Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error in D:\xampp\htdocs\classes\DB.php:37 Stack trace: #0 D:\xampp\htdocs\classes\DB.php(37): PDOStatement->fetchAll(5) #1 D:\xampp\htdocs\classes\DB.php(93): DB->query('INSERT INTO use...', Array) #2 D:\xampp\htdocs\test.php(4): DB->insert('users', Array) #3 {main} thrown in D:\xampp\htdocs\classes\DB.php on line 37
Thanks in advance, that would help me a lot!