Undefined function litespeed_oc_disable_ext_cache

Hi, when filling out the Object Cache settings the first time and saving, I got this error:

Une erreur de type E_ERROR a été causée dans la ligne 586 du fichier /home/xxx/xxx.fr/wp-content/plugins/litespeed-cache/src/object-cache.cls.php. Message d’erreur : Uncaught Error: Call to undefined function LiteSpeed\litespeed_oc_disable_ext_cache() in /home/xxx/xxx.fr/wp-content/plugins/litespeed-cache/src/object-cache.cls.php:586
Stack trace:
#0 /home/xxx/xxx.fr/wp-content/plugins/litespeed-cache/src/object-cache.cls.php(444): LiteSpeed\Object_Cache->_connect()
#1 /home/xxx/xxx.fr/wp-content/plugins/litespeed-cache/src/object-cache.cls.php(389): LiteSpeed\Object_Cache->_reconnect()
#2 /home/xxx/xxx.fr/wp-content/plugins/litespeed-cache/src/activation.cls.php(338): LiteSpeed\Object_Cache->update_file()
#3 /home/xxx/xxx.fr/wp-content/plugins/litespeed-cache/src/conf.cls.php(511): LiteSpeed\Activation->update_files()
#4 /home/xxx/xxx.fr/wp-content/plugins/litespeed-cache/src/admin-settings.cls.php(295): LiteSpeed\Conf->update_confs()
#5 /home/xxx/xxx.fr/wp-content/plugins/litespeed-cache/src/admin.cls.php(146): LiteSpeed\Admin_Settings->save()
#6 /home/xxx/xxx.fr/wp-content/plugins/litespeed-cache/src/admin.cls.php(70): LiteSpeed\Admin->_proceed_admin_action()
#7 /home/xxx/xxx.fr/wp-includes/class-wp-hook.php(341): LiteSpeed\Admin->admin_init()
#8 /home/xxx/xxx.fr/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters()
#9 /home/xxx/xxx.fr/wp-includes/plugin.php(522): WP_Hook->do_action()
#10 /home/xxx/xxx.fr/wp-admin/admin.php(180): do_action()
#11 {main}
  thrown

Refreshing the page and even modifying settings did not cause the error anymore. It only happened once.

I should note that the first settings I did, after which the error occurred, were: Redis with socket path set and port 0, but leaving empty the password (which the server setup actually requires). So I was expecting the connection test to fail, but instead I got this error. But like I said: only ONE time. Not after removing the password again or switching between Memcached and Redis or anything…