UM Upgrade fail after clone

Hi all together,

i’ve a WordPress Multisite in which i would like to have two sites with UM. I’ve finished the one site and cloned it via NSCloner. It worked perfectly but UM gives me a message in the backend that the UM Version needs to be upgraded – which i tried. It always fails with an PHP Error. Can anyone help with this topic?

Upgrade Process Started...
Get Upgrades Packages...
Upgrades Packages are ready, start unpacking...

=================================================================
Prepare package "2.0-beta1" version...

Package "2.0-beta1" is ready. Start the execution...
Aktualisiere Stile ...
Stile wurden erfolgreich aktualisiert
Aktualisiere Rollen...
Benutzerrollen wurden erfolgreich aktualisiert
Aktualisiere Benutzer...
Upgrade-Einstellungen für die Inhaltsbeschränkung…
Content restriction settings was upgraded successfully
Aktualisiere Einstellungen...
Die Menü-Einstellungen wurden erfolgreich aktualisiert
Upgrade Menüpunkte ...
Die Menü-Einstellungen wurden erfolgreich aktualisiert
Mailchimp-Listen aktualisieren ...
Mailchimp Lists wurde erfolgreich aktualisiert
Aktualisiere Anmeldeformulare für soziale Netzwerke ...
Social Login-Formulare wurden erfolgreich aktualisiert
Upgrade von individuellen UM-Posttypen ...
Something went wrong with AJAX request...
Your upgrade was crashed, please contact with support

PHP Error:

[20-Jul-2025 08:54:03 UTC] PHP Fatal error:  Uncaught TypeError: Cannot access offset of type array on array in /home/xxxxx/public_html/xxxxxxxxxx.de/wp-content/plugins/ultimate-member/includes/admin/core/packages/2.0-beta1/um-cpt.php:28
Stack trace:
#0 /home/xxxxxx/public_html/xxxxxxxxxx.de/wp-content/plugins/ultimate-member/includes/admin/core/packages/2.0-beta1/functions.php(153): include()
#1 /home/xxxxxx/public_html/xxxxxxxxxx.de/wp-includes/class-wp-hook.php(324): um_upgrade_cpt20beta1('')
#2 /home/xxxxxx/public_html/xxxxxxxxxx.de/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters('', Array)
#3 /home/xxxxxx/public_html/xxxxxxxxxx.de/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#4 /home/xxxxxx/public_html/xxxxxxxxxx.de/wp-admin/admin-ajax.php(192): do_action('wp_ajax_um_cpt2...')
#5 {main}
  thrown in /home/xxxxxx/public_html/xxxxxxxxxx.de/wp-content/plugins/ultimate-member/includes/admin/core/packages/2.0-beta1/um-cpt.php on line 28

Best regards
Julian