Custom User Register Form - Errors Upon Validation Checks

Hi

I am trying to override the wordpress register form, all works ok except if you don't fill in the user_pass field and submit the form I receive the following error: Undefined array key "user_pass" in C:\wamp\www\dcplatform\wp-includes\user.php on line 2103 and Warning: Cannot modify header information - headers already sent by (output started at C:\wamp\www\dcplatform\wp-includes\user.php:2103) in C:\wamp\www\dcplatform\wp-includes\pluggable.php on line 1435

$meta_boxes[] = [
	'title'   => '', 
	'type' => 'user', 
	'storage_type' => 'custom_table', 
	'table'        => $wpdb->prefix . 'dc_users',
	'id'      => 'dc-user-register', 
	'context' => 'normal',
	'fields'  => [
		[
			'type'  => 'text',
			'name'  => 'First Name', //label for form
			'id'    => 'first_name', //mysql name (custom table)
			'required' => true,
		],
		[
			'type'  => 'text',
			'name'  => 'Last Name', //label for form
			'id'    => 'last_name', //mysql name (custom table)
			'required' => true,
		],
		[
			'name'     => 'Email',
			'id'       => 'user_email', //REQUIRED (default WP field)
			'type'     => 'email',
			'required' => true,
		],
		[
			'id'   => 'registered_date', //mysql table col
			'type' => 'hidden',
			'std'  => date('Y-m-d H:i:s'), 
		],
		[
			'name'     => 'Password',
			'id'       => 'user_pass', //REQUIRED (default WP field)
			'type'     => 'dc_password_strength_checker',
			'required' => true,
			'attributes' => [
				'minCharacters' => 8, //min password length
				'lowerUpperCase' => true, //contain lower & uppercase
				'numbers' => true, //contain numbers
				'specialCharacters' => false, //contain special characters
			],
		],
	],
];

I forced the validation to fail and with checks but it does not work as the above errors still display?

if ( 'dc-user-register' !== $config['id'] ) { 
   return 'test';
}