8.3.6 Plugin throws exception when language is not NL or EN

When invoices are exported automatically, or when opening the Batchverzending page, the plugin throws this exception:

DomainException: lang: not an allowed value: 'es' in xxxx/public_html/wp-content/plugins/acumulus/vendor/siel/acumulus/src/Data/AcumulusProperty.php:212
Stack trace:
#0 xxxx/public_html/wp-content/plugins/acumulus/vendor/siel/acumulus/src/Data/AcumulusObject.php(259): Siel\Acumulus\Data\AcumulusProperty->setValue('es', 0)
#1 xxxx/public_html/wp-content/plugins/acumulus/vendor/siel/acumulus/src/Collectors/Collector.php(266): Siel\Acumulus\Data\AcumulusObject->set('lang', 'es', 0)
#2 xxxx/public_html/wp-content/plugins/acumulus/vendor/siel/acumulus/src/Collectors/Collector.php(224): Siel\Acumulus\Collectors\Collector->collectMappedField(Object(Siel\Acumulus\Data\BasicSubmit), Object(Siel\Acumulus\Collectors\PropertySources), 'lang', '[environment::l...')
#3 xxxx/public_html/wp-content/plugins/acumulus/vendor/siel/acumulus/src/Collectors/Collector.php(172): Siel\Acumulus\Collectors\Collector->collectMappedFields(Object(Siel\Acumulus\Data\BasicSubmit), Object(Siel\Acumulus\Collectors\PropertySources), Array)
#4 xxxx/public_html/wp-content/plugins/acumulus/vendor/siel/acumulus/src/Collectors/BasicSubmitCollector.php(35): Siel\Acumulus\Collectors\Collector->collect(Object(Siel\Acumulus\Collectors\PropertySources), Array)
#5 xxxx/public_html/wp-content/plugins/acumulus/vendor/siel/acumulus/src/Collectors/CollectorManager.php(183): Siel\Acumulus\Collectors\BasicSubmitCollector->collect(Object(Siel\Acumulus\Collectors\PropertySources), Array)
#6 xxxx/public_html/wp-content/plugins/acumulus/vendor/siel/acumulus/src/ApiClient/AcumulusRequest.php(241): Siel\Acumulus\Collectors\CollectorManager->collectBasicSubmit()
#7 xxxx/public_html/wp-content/plugins/acumulus/vendor/siel/acumulus/src/ApiClient/AcumulusRequest.php(228): Siel\Acumulus\ApiClient\AcumulusRequest->getBasicSubmit()
#8 xxxx/public_html/wp-content/plugins/acumulus/vendor/siel/acumulus/src/ApiClient/AcumulusRequest.php(132): Siel\Acumulus\ApiClient\AcumulusRequest->constructFullSubmit(Array, true)
#9 xxxx/public_html/wp-content/plugins/acumulus/vendor/siel/acumulus/src/ApiClient/Acumulus.php(938): Siel\Acumulus\ApiClient\AcumulusRequest->execute('https://api.sie...', Array, true)
#10 xxxx/public_html/wp-content/plugins/acumulus/vendor/siel/acumulus/src/ApiClient/Acumulus.php(349): Siel\Acumulus\ApiClient\Acumulus->callApiFunction('lookups/lookup_...', Array)
#11 xxxx/public_html/wp-content/plugins/acumulus/vendor/siel/acumulus/src/Invoice/Completor.php(1497): Siel\Acumulus\ApiClient\Acumulus->getVatInfo('NL', '2024-12-13')
#12 xxxx/public_html/wp-content/plugins/acumulus/vendor/siel/acumulus/src/Invoice/Completor.php(377): Siel\Acumulus\Invoice\Completor->getVatRatesByCountryAndInvoiceDate('NL')
#13 xxxx/public_html/wp-content/plugins/acumulus/vendor/siel/acumulus/src/Invoice/Completor.php(194): Siel\Acumulus\Invoice\Completor->initPossibleVatRates()
#14 xxxx/public_html/wp-content/plugins/acumulus/vendor/siel/acumulus/src/Completors/InvoiceCompletor.php(82): Siel\Acumulus\Invoice\Completor->complete(Object(Siel\Acumulus\Data\Invoice), Object(Siel\Acumulus\WooCommerce\Invoice\Source), Object(Siel\Acumulus\Invoice\InvoiceAddResult))
#15 xxxx/public_html/wp-content/plugins/acumulus/vendor/siel/acumulus/src/Shop/InvoiceCreate.php(79): Siel\Acumulus\Completors\InvoiceCompletor->complete(Object(Siel\Acumulus\Data\Invoice), Object(Siel\Acumulus\Invoice\InvoiceAddResult))
#16 xxxx/public_html/wp-content/plugins/acumulus/vendor/siel/acumulus/src/Shop/InvoiceManager.php(421): Siel\Acumulus\Shop\InvoiceCreate->create(Object(Siel\Acumulus\WooCommerce\Invoice\Source), Object(Siel\Acumulus\Invoice\InvoiceAddResult))
#17 xxxx/public_html/wp-content/plugins/acumulus/vendor/siel/acumulus/src/Shop/InvoiceManager.php(328): Siel\Acumulus\Shop\InvoiceManager->createAndSend(Object(Siel\Acumulus\WooCommerce\Invoice\Source), Object(Siel\Acumulus\Invoice\InvoiceAddResult))
#18 xxxx/public_html/wp-content/plugins/acumulus/acumulus.php(1075): Siel\Acumulus\Shop\InvoiceManager->sourceStatusChange(Object(Siel\Acumulus\WooCommerce\Invoice\Source))
#19 xxxx/public_html/wp-content/plugins/acumulus/acumulus.php(1042): Acumulus->sourceStatusChange('Order', Object(Automattic\WooCommerce\Admin\Overrides\Order))
#20 xxxx/public_html/wp-includes/class-wp-hook.php(324): Acumulus->woocommerceOrderChanged(26428, 'processing', 'completed', Object(Automattic\WooCommerce\Admin\Overrides\Order))
#21 xxxx/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters('', Array)
#22 xxxx/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#23 xxxx/public_html/wp-content/plugins/woocommerce/includes/class-wc-order.php(421): do_action('woocommerce_ord...', 26428, 'processing', 'completed', Object(Automattic\WooCommerce\Admin\Overrides\Order))
#24 xxxx/public_html/wp-content/plugins/woocommerce/includes/class-wc-order.php(253): WC_Order->status_transition()
#25 xxxx/public_html/wp-content/plugins/woocommerce/includes/class-wc-order.php(365): WC_Order->save()
#26 xxxx/public_html/wp-content/plugins/woocommerce/includes/class-wc-ajax.php(585): WC_Order->update_status('completed', '', true)
#27 xxxx/public_html/wp-includes/class-wp-hook.php(324): WC_AJAX::mark_order_status('')
#28 xxxx/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters('', Array)
#29 xxxx/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#30 xxxx/public_html/wp-admin/admin-ajax.php(192): do_action('wp_ajax_woocomm...')
#31 {main}