Got a fatal error in my php code, trying to make catalog website

Fatal error: Uncaught mysqli_sql_exception: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'id']?>', 'Ayam Utuh 1 Potong ', '20000', ' at line 3 in C:laragonwwwkatalogtambah-produk.php:102 Stack trace: #0 C:laragonwwwkatalogtambah-produk.php(102): mysqli_query(Object(mysqli), 'INSERT INTO mas...') #1 {main} thrown in C:laragonwwwkatalogtambah-produk.php on line 102

Here is my code on PHP

<?php
               if(isset($_POST['submit'])){

              //contains input from form//
              $kategori   = $_POST['kategori'];
              $nama       = $_POST['nama'];
              $harga      = $_POST['harga'];
              $deskripsi   = $_POST['deskripsi'];
              $supplier  = $_POST['supplier'];
              $stok  = $_POST['stok'];
              //contains uploaded files//
              $filename = $_FILES['foto']['name'];
              $tmp_name = $_FILES['foto']['tmp_name'];

              $type1 = explode('.', $filename);
              $type2 = $type1[1];
              $newname = 'produk' .time().'.'.$type2;

              //Contains allowed images formats//
                 
                $tipe_diijinkan = array('jpg', 'jpeg', 'png', 'webp');            
              move_uploaded_file($tmp_name, './produk/' .$newname);

              $insert = mysqli_query($koneksi, "INSERT INTO master VALUES (
                null,
                '".$kategori."',
                '".$nama."',
                '".$harga."',
                '".$deskripsi."',
                '".$newname."',
                '".$supplier."',
                '".$stok."',
                null
                )
                    " );


                 if($insert){
                    echo "Simpan data berhasil";
                   
            ?>

For summary here is my database My master table (products)
my category table My category column

Tried to change some of the variables like $kategori to $id_kategori, more errors, i dont know any solutions other than that, but i have try opens the product images file folder in my website folder, the images just adds and it is there.