Problem:Database update blocked at 40%

I updated the “Hotel Booking Lite” plugin to the latest version 3.5.1 and this alert message appeared at the top:

“Hotel Booking Plugin – The database update proceeds in the background. This may take some time. Click here to run it now.(40%)”

If I click on to run it now it gives me the following errors:

Un errore di E_ERROR è stato causato nella linea 470 del file /web/htdocs/www.miosito.it/home/wp-content/plugins/motopress-hotel-booking-lite/includes/upgrader.php. Messaggio di errore: Uncaught Error: Call to undefined method HotelBookingPlugin::getQueuedSynchronizer() in /web/htdocs/www.miosito.it/home/wp-content/plugins/motopress-hotel-booking-lite/includes/upgrader.php:470
Stack trace:
#0 [internal function]: MPHB\Upgrader->markImported()
#1 /web/htdocs/www.miosito.it/home/wp-content/plugins/motopress-hotel-booking-lite/includes/upgrades/background-upgrader.php(13): call_user_func(Array)
#2 /web/htdocs/www.miosito.it/home/wp-content/plugins/motopress-hotel-booking-lite/includes/background-pausable-process.php(118): MPHB\Upgrades\BackgroundUpgrader->task(‘markImported’)
#3 /web/htdocs/www.miosito.it/home/wp-content/plugins/motopress-hotel-booking-lite/includes/background-pausable-process.php(100): MPHB\BackgroundPausableProcess->handle()
#4 /web/htdocs/www.miosito.it/home/wp-includes/class-wp-hook.php(286): MPHB\BackgroundPausableProcess->handle_cron_healthcheck(”)
#5 /web/htdocs/www.miosito.it/home/wp-includes/class-wp-hook.php(310): WP_Hook->ap

Is it possible to solve the problem?
Thanks!

Wordpress Version: 5.2.2
SERVER
Architettura del server: Linux 3.10.0-862.2.3.el7.x86_64 x86_64
Server web: Apache
Versione di PHP: 7.2.17 (supporta valori a 64bit)
PHP SAPI: cgi-fcgi
Variabile PHP max input: 1000
Limite di tempo PHP: 900
Limite di memoria PHP: 256M
Max input time: 60
Dimensione massima di upload dei file: 50M
Dimensione massima del post PHP: 30M
Versione di cURL: 7.64.1 OpenSSL/1.0.2k

DATABASE
Estensione: mysqli
Versione del server: 5.7.26-29-log