Broken on Polylang 3.7.3

[sebastienserre]

Describe the bug
Reported on https://secure.helpscout.net/inboxes/6970aa9fc440ce48/views/3655443
Activating this plugin with Polylang (Pro) 3.7.3 is generating an error:

[15-Aug-2025 07:35:45 UTC] PHP Fatal error:  Uncaught Error: Call to undefined function PLL() in /app/wp-content/plugins/polylang/include/Options/Business/Language_Taxonomies.php:41
Stack trace:
#0 /app/wp-content/plugins/polylang/include/Options/Business/Abstract_Object_Types.php(41): WP_Syntex\Polylang\Options\Business\Language_Taxonomies->get_object_types()
#1 /app/wp-content/plugins/polylang/include/Options/Abstract_Option.php(103): WP_Syntex\Polylang\Options\Business\Abstract_Object_Types->sanitize(Array, Object(WP_Syntex\Polylang\Options\Options))
#2 /app/wp-content/plugins/polylang/include/Options/Options.php(400): WP_Syntex\Polylang\Options\Abstract_Option->set(Array, Object(WP_Syntex\Polylang\Options\Options))
#3 /app/wp-content/plugins/polylang/include/Options/Options.php(471): WP_Syntex\Polylang\Options\Options->set('language_taxono...', Array)
#4 /app/wp-content/plugins/polylang/include/Model/Languages.php(723): WP_Syntex\Polylang\Options\Options->offsetSet('language_taxono...', Array)
#5 /app/wp-content/plugins/polylang/include/model.php(161): WP_Syntex\Polylang\Model\Languages->maybe_create_terms()
#6 /app/wp-content/plugins/polylang/include/class-polylang.php(269): PLL_Model->__call('maybe_create_la...', Array)
#7 /app/wp-content/plugins/polylang/include/class-polylang.php(234): Polylang->init_context('PLL_Admin', Object(PLL_Model))
#8 /app/wp-includes/class-wp-hook.php(324): Polylang->init('')
#9 /app/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)
#10 /app/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#11 /app/wp-settings.php(578): do_action('plugins_loaded')
#12 /app/wp-config.php(98): require_once('/app/wp-setting...')
#13 /app/wp-load.php(50): require_once('/app/wp-config....')
#14 /app/wp-admin/admin.php(35): require_once('/app/wp-load.ph...')
#15 /app/wp-admin/plugins.php(10): require_once('/app/wp-admin/a...')
#16 {main}
  thrown in /app/wp-content/plugins/polylang/include/Options/Business/Language_Taxonomies.php on line 41

To Reproduce
Steps to reproduce the behavior:

1. Clone the repo
2. run composer install
3. try to activate the plugin
4. See error