wp-migrate-db-pro-skip-serialized-refs.php

<?php
/*
Plugin Name: WP Migrate DB Pro Tweak: Skip Serialized Refs in Options Table
Plugin URI: http://github.com/deliciousbrains/wp-migrate-db-pro-tweaks
Description: Skip unserializing / replacing data that contains serialized references as this can cause an infinite loop.
Author: Delicious Brains
Version: 1
Author URI: http://deliciousbrains.com
*/

add_filter( 'wpmdb_pre_recursive_unserialize_replace', function ( $pre, $data, $wpmdb_replace ) {

	if ( false !== $pre ) {
		return $pre;
	}

	if ( empty( $data ) ) {
		return $pre;
	}

	if ( $wpmdb_replace->table_is( 'options' ) && 'option_value' === $wpmdb_replace->get_column() && is_serialized( $data ) ) {
		if ( preg_match( '/r\:\d+/i', $data ) ) {
			return $data;
		}
	}

	return $pre;

}, 10, 3 );