/* Try to find member */
			$member = \IPS\Member::load( $userData['id'], 'my_custom_id' );

You can't use my_custom_id here

Your error

system/Patterns/ActiveRecord.php

		/* If we did, check it's valid */
		elseif( !in_array( $idField, static::$databaseIdFields ) )
		{
			throw new \InvalidArgumentException;
		}

system/Member/Member.php

	/**
	 * @brief	[ActiveRecord] Database ID Fields
	 */
	protected static $databaseIdFields = array( 'name', 'email', 'fb_uid', 'live_id', 'google_id', 'linkedin_id', 'ipsconnect_id', 'twitter_id' );

 

Should I expand the array $databaseIdFields?

Add your key in array extended \IPS\Member class

or use another way to find member

Example 

		try
		{
			$member = \IPS\Member::constructFromData( \IPS\Db::i()->select( '*', 'core_members', array( 'my_custom_id=?', $userData['id'] ) )->first() );
		}
		catch (\Exception $e)
		{
		}

 

Yes 

 

I can't expand the array, different ways I tried still goes error(

What did you try?

 

One way would be to override setDefaultValues to add your custom key

 

What did you try?

 

One way would be to override setDefaultValues to add your custom key

Thanks, problem solved.

If anybody else is interested into this:

public function setDefaultValues()
{
        parent::setDefaultValues();
        static::$databaseIdFields[] = 'your_new_id_field';
}