Fatal Error: Uncaught Error: Call to a member function insert() on null

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So I created a custom registration form template (PHP File) in astra theme folder (the theme I currently use) and I used that template in my wordpress site. However, the registration form encounters a critical error upon submission.I saw in the errors log file of wordpress that the error encountered is:

Fatal Error: Uncaught Error: Call to a member function insert() on null

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I searched a lot of forums and tried adding

global $wpdb;

and

require\_once($\_SERVER\[‘DOCUMENT\_ROOT’\] . $folder . ‘/secret/wp-config.php’);

require\_once($\_SERVER\[‘DOCUMENT\_ROOT’\] . $folder . ‘/secret/wp-load.php’);

both separately and at the same time yet I still encounter the same error. I checked the file path and there’s no error regarding that, the same error appears.

I also checked the database permissions and the wp-config and wp-load files and all the data is correct.

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I don’t know what else I can do, did anyone else encounter this problem?

Thank you!

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Edit:By the way here is the code that encounters an error

$wpdb->insert(‘user\_transactions’, array(

‘UID’ => $uid,

‘PRODUCT’ => $product,

‘TRANSACTION_AMOUNT’ => $amount,

‘ENROLLMENT’ => $enrollment,

‘LOCKED’ => $locked

));

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