Fatal Error in my php script - php

Question

I am using Opencart v2.2.0 and I am having problem with my php script. The line in question is:
$stmt2->bind_param('sssssisi', $name, $description, $meta_description, $meta_keyword, $tag, $modified_by, $product_id, $language_id);
The whole function including the line above is as follows:
function restoreBackup()
{
global $mysqli;
$i = 0;
$getpic = "SELECT * FROM oc_product_backup LIMIT 0, 100000";
$backup = $mysqli->query($getpic);
$mysqli->autocommit(FALSE);
$updateproduct_sql = "UPDATE oc_product SET image = ?, ean = ?, model = ?, status = ?, price_sync = ?, modified_by = ?, date_modified = ? WHERE product_id= ?";
$updatedescription_sql = "UPDATE oc_product_description SET name = ?, description = ?, meta_description = ?, meta_keyword = ?, tag = ?, modified_by = ? WHERE product_id = ? AND language_id = ?";
$stmt = $mysqli->prepare($updateproduct_sql);
$stmt->bind_param('sssiiiss', $image, $ean, $model, $status, $price_sync, $modified_by, $date_modified, $product_id);
$stmt2 = $mysqli->prepare($updatedescription_sql);
$stmt2->bind_param('sssssisi', $name, $description, $meta_description, $meta_keyword, $tag, $modified_by, $product_id, $language_id);
while($row = $backup->fetch_array(MYSQLI_ASSOC))
{
//$name = removeslashes($row['name']);
$name = $row['name'];
//$description = removeslashes($row['description']);
$description = $row['description'];
$meta_description = $row['meta_description'];
$meta_keyword = $row['meta_keyword'];
$tag = $row['tag'];
$product_id = $row['product_id'];
$modified_by = $row['modified_by'];
$language_id = $row['language_id'];
if($row['language_id'] == 4)
{
$image = $row['image'];
$ean = $row['ean'];
$name = $row['name'];
$model = $row['model'];
$status = $row['status'];
$price_sync = $row['price_sync'];
$date_modified = $row['date_modified'];
if(!$stmt->execute())
return false;
}
if(!$stmt2->execute())
return false;
$i++;
if(($i % 500) === 0) $mysqli->commit();
}
$mysqli->commit();
$backup->close();
return true;
}
function removeslashes($string)
{
$string=implode("",explode("\\",$string));
return stripslashes(trim($string));
}
The error I get is
Fatal error: Call to a member function bind_param() on boolean in
Any suggestions, please? I do not see what am I doing wrong. Thank you all in advance.

Answer 1

The prepare() method can return false and you should check for that. As for why it returns false, perhaps the table name or column names (in SELECT, UPDATE or WHERE clause) are not correct?
Also, consider use of something like $query->error_list to examine errors that occurred parsing the SQL. (I'll occasionally echo the actual SQL statement strings and paste into phpMyAdmin to test, too, but there's definitely something failing there.)