включенные файлы создают вызов функции-члена fetch_assoc () для необъекта

Пытаясь интегрировать новый скрипт с моей существующей домашней страницей, мне нужно включить 2 новых файла php в мой index.php. Я люблю играть с веб-разработкой, но, к сожалению, мои знания в области кодирования очень ограничены. (CMS и GUI делают человека глупым)

if ($page == 'Premium') {
include('affiliates/controller/affiliate-tracking.php');

if (isset($_GET['payment']) && $_GET['payment'] == 'created') {
$sale_amount = '5.00';
$product = 'Premium';

include('affiliates/controller/record-sale.php');

}
}

Если я сделаю это, я получу фатальную ошибку: вызов функции-члена fetch_assoc () для необъекта в affiliates / controller / record-sale.php в строке 61.

Код в строке 61:

$stmt->execute();

Может ли кто-нибудь указать мне правильное направление здесь? Я не совсем уверен, что означает ошибка. Кажется, что нет никаких ошибок в базе данных, и все другие функции работают так, как они должны.

Спасибо любому самаритянину, который ответит.

Использование mysqli
Полный код для record-sale.php:

application/x-httpd-php record-sale.php ( PHP script text )

<?php
$path = dirname(__FILE__);
$path = substr($path, 0, -10);
include($path.'/auth/db-connect.php');
$ap_tracking = 'ap_ref_tracking';
$datetime = date("Y-m-d H:i:s");

//IF AFFILIATE ID IS PRESENT
if(isset($_COOKIE[$ap_tracking])){
session_start();

//GET COMMISSION LEVEL
$get_dc = mysqli_fetch_assoc(mysqli_query($mysqli, "SELECT default_commission FROM ap_settings WHERE id=1"));
$default_commission = $get_dc['default_commission'];

//IS SALE VOLUME COMMISSIONS ON
$get_sv = mysqli_fetch_assoc(mysqli_query($mysqli, "SELECT sv_on FROM ap_other_commissions WHERE id=1"));
$sv_on = $get_sv['sv_on'];

if($sv_on=='1'){
$get_cl = mysqli_fetch_assoc(mysqli_query($mysqli, "SELECT percentage FROM ap_commission_settings WHERE $sale_amount BETWEEN sales_from AND sales_to"));
$comission = $get_cl['percentage'];
}

//COMMISSION OVERRIDE
$comission = $commission;

//SET DEFAULT COMMISSION IF NO OTHER VALUE HAS BEEN SET
if($comission==''){$comission = $default_commission;}

//RECURRING COMMISSIONS
if(isset($recurring)){
$recurring_period = strtolower($recurring);
$recurring_amount = $recurring_fee;
if($recurring_period==''){$recurring_period='monthly';}
if($recurring_fee==''){$recurring_fee = $default_commission;}
}else{
$recurring_period = 'Non-recurring';
$recurring_fee = '0';
}

//RECORD SALE
$affiliate_id = $_COOKIE[$ap_tracking];
$percentage = $comission / 100;
$net_earnings = $sale_amount * $percentage;
$datetime = date("Y-m-d H:i:s");

//CHECK FOR VALID AFFILIATE
$get_affiliate = mysqli_fetch_assoc(mysqli_query($mysqli, "SELECT balance FROM ap_members WHERE id=$affiliate_id"));
$affiliate_balance = $get_affiliate['balance'];

if(isset($affiliate_balance)){
//PREVENT DUPLICATE SALES
if($_SESSION['ap_sale_hit']=='1' && $affiliate_id == $_SESSION['saved_affiliate'] && $net_earnings == $_SESSION['saved_net']){}else{
$stmt = $mysqli->prepare("INSERT INTO ap_earnings (affiliate_id, product, comission, sale_amount, net_earnings, recurring, recurring_fee, datetime) VALUES (?, ?, ?, ?, ?, ?, ?, ?)");
$stmt->bind_param('ssssssss', $affiliate_id, $product, $comission, $sale_amount, $net_earnings, $recurring_period, $recurring_fee, $datetime);
$stmt->execute();
$transaction_id = $stmt->insert_id;
$stmt->close();
//UPDATE AFFILIATE BALANCE
$updated_balance = $affiliate_balance + $net_earnings;
$update_one = $mysqli->prepare("UPDATE ap_members SET balance = ? WHERE id=$affiliate_id");
$update_one->bind_param('s', $updated_balance);
$update_one->execute();
$update_one->close();

}
}

//MULT-TIER COMMISSIONS
$get_mt = mysqli_fetch_assoc(mysqli_query($mysqli, "SELECT mt_on FROM ap_other_commissions WHERE id=1"));
$mt_on = $get_mt['mt_on'];
if($mt_on=='1'){
$levels = 10;
//FOR EACH LEVEL RUN
$get_sponsor = mysqli_fetch_assoc(mysqli_query($mysqli, "SELECT sponsor FROM ap_members WHERE id=$affiliate_id"));
$sponsor = $get_sponsor['sponsor'];
for ($loop = 2 ; $loop < $levels; $loop++){

//CHECK FOR AVAILABLE SPONSOR
if($sponsor!='0'){

//GET LEVEL PERCENTAGE
$gp = mysqli_fetch_assoc(mysqli_query($mysqli, "SELECT * FROM ap_other_commissions WHERE id=1"));
$p = $gp['tier'.$loop.''];
$sc = $p / 100;
$se = $sale_amount * $sc;

//GET SPONSOR BALANCE
$gb = mysqli_fetch_assoc(mysqli_query($mysqli, "SELECT balance FROM ap_members WHERE id=$sponsor"));
$ob = $gb['balance'];
$nb = $ob + $se;
$update_one = $mysqli->prepare("UPDATE ap_members SET balance = ? WHERE id=$sponsor");
$update_one->bind_param('s', $nb);
$update_one->execute();
$update_one->close();

//INSERT TRANSACTION HISTORY
$stmt = $mysqli->prepare("INSERT INTO ap_multi_tier_transactions (affiliate_id, transaction_id, tier, commission, mt_earnings, datetime) VALUES (?, ?, ?, ?, ?, ?)");
$stmt->bind_param('ssssss', $sponsor, $transaction_id, $loop, $p, $se, $datetime);
$stmt->execute();
$stmt->close();
}else{
break 1;
}
//GET NEXT SPONSOR FOR NEXT LOOP
$gs = mysqli_fetch_assoc(mysqli_query($mysqli, "SELECT sponsor FROM ap_members WHERE id=$sponsor"));
$sponsor = $gs['sponsor'];
}
}

$_SESSION['ap_sale_hit'] = '1';
$_SESSION['saved_affiliate'] = $affiliate_id;
$_SESSION['saved_net'] = $net_earnings;

}

if(isset($_POST['reset'])){
unset($_SESSION['ap_sale_hit']);
unset($_SESSION['saved_affiliate']);
unset($_SESSION['saved_net']);
//header("Refresh:0");
}
?>