After installing the Airwallex Payments plugin for WooCommerce, WPML Multilingual & Multicurrency immediately fails to load and WordPress enters recovery mode. The error originates from class-wcml-wc-gateways.php when WPML attempts to translate gateway strings.
The fatal error:
Uncaught TypeError: WCML_WC_Gateways::translate_gateway_strings():
Argument #1 ($gateway) must be of type WC_Payment_Gateway,
Airwallex\Gateways\Settings\APISettings given
This shows that WPML is treating an object from the Airwallex plugin (Airwallex\Gateways\Settings\APISettings) as a payment gateway, even though it does not extend WC_Payment_Gateway.
It appears that when WPML filters the list of WooCommerce payment gateways, it does not validate that each gateway conforms to WooCommerce’s expected interface before attempting translation. This triggers an immediate E_ERROR.
Can you confirm whether WPML can add a type check or exclusion logic so non-gateway objects do not break the translation flow?
If needed, we can provide access to a staging environment or the full stack trace.
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Hello,
It looks like this error occurs when trying to translate the API setting of "Airwallex Online Payments Gateway".
Could you please verify if you have translated any settings (admin_texts) for this plugin on WPML > String Translation?
If there are translated admin_texts strings for the plugin, please verify that they are translated correctly, or try deleting the string from WPML > String Translation.
If this does not solve the issue, we can offer to take further steps.
Hey Andreas thanks so much for your answer. Unfortunately I can't find any String Translations that reference the Airwallex plugin and not in the "domains" list either. I can provide you access if easier? Sites in staging so its all good.
I would like to request temporary access (wp-admin and FTP) to your site to test the issue.
(preferably to a test site where the problem has been replicated if possible)
**Before we proceed It is necessary to take FULL BACKUP of your database and your website. Providing us with access, you agree that a backup has been taken **
I often use the Duplicator plugin for this purpose: http://wordpress.org/plugins/duplicator/
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The information you enter is private which means only you and I have access to it.
NOTE: If access to the live site is not possible and the staging site does not exist please provide me with a duplicator package created with the duplicator plugin.
I can confirm that the issue remains with the latest versions.
Airwallex is not an officially compatible plugin with WPML, meaning that we have not tested this plugin before.
At the moment I can also reproduce the behavior in a sandbox environment.
This is ultimately an Airwallex plugin bug: APISettings should not be registered as a gateway in the WooCommerce gateways list.
If possible please report it to Airwallex and share the following log with them
Fatal error: Uncaught TypeError: WCML_WC_Gateways::translate_gateway_strings(): Argument #1 ($gateway) must be of type WC_Payment_Gateway, Airwallex\Gateways\Settings\APISettings given, called in /home/customer/www/staging2.swftconnect.com/public_html/wp-content/plugins/woocommerce-multilingual/inc/class-wcml-wc-gateways.php on line 112 and defined in /home/customer/www/staging2.swftconnect.com/public_html/wp-content/plugins/woocommerce-multilingual/inc/class-wcml-wc-gateways.php:117 Stack trace: #0 /home/customer/www/staging2.swftconnect.com/public_html/wp-content/plugins/woocommerce-multilingual/inc/class-wcml-wc-gateways.php(112): WCML_WC_Gateways->translate_gateway_strings(Object(Airwallex\Gateways\Settings\APISettings)) #1 /home/customer/www/staging2.swftconnect.com/public_html/wp-content/plugins/woocommerce-multilingual/inc/class-wcml-wc-gateways.php(79): WCML_WC_Gateways->payment_gateways_filters(Object(Airwallex\Gateways\Settings\APISettings)) #2 [internal function]: WCML_WC_Gateways->loaded_woocommerce_payment_gateways(Array) #3 /home/customer/www/staging2.swftconnect.com/public_html/wp-content/plugins/sitepress-multilingual-cms/vendor/wpml/fp/core/Fns.php(358): call_user_func_array(Array, Array) #4 /home/customer/www/staging2.swftconnect.com/public_html/wp-includes/class-wp-hook.php(341): WPML\FP\Fns::WPML\FP\{closure}(Array) #5 /home/customer/www/staging2.swftconnect.com/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters(Array, Array) #6 /home/customer/www/staging2.swftconnect.com/public_html/wp-content/plugins/woocommerce/includes/class-wc-payment-gateways.php(92): apply_filters('woocommerce_pay...', Array) #7 /home/customer/www/staging2.swftconnect.com/public_html/wp-content/plugins/woocommerce/includes/class-wc-payment-gateways.php(77): WC_Payment_Gateways->init() #8 /home/customer/www/staging2.swftconnect.com/public_html/wp-content/plugins/woocommerce/includes/class-wc-payment-gateways.php(50): WC_Payment_Gateways->__construct() #9 /home/customer/www/staging2.swftconnect.com/public_html/wp-content/plugins/woocommerce/includes/class-woocommerce.php(1205): WC_Payment_Gateways::instance() #10 /home/customer/www/staging2.swftconnect.com/public_html/wp-content/plugins/woocommerce-multilingual/classes/multi-currency/payment-gateways/class-wcml-currencies-payment-gateways.php(207): WooCommerce->payment_gateways() #11 /home/customer/www/staging2.swftconnect.com/public_html/wp-content/plugins/woocommerce-multilingual/classes/multi-currency/payment-gateways/class-wcml-currencies-payment-gateways.php(92): WCML_Currencies_Payment_Gateways->get_available_payment_gateways() #12 /home/customer/www/staging2.swftconnect.com/public_html/wp-includes/class-wp-hook.php(341): WCML_Currencies_Payment_Gateways->init_gateways('') #13 /home/customer/www/staging2.swftconnect.com/public_html/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters(NULL, Array) #14 /home/customer/www/staging2.swftconnect.com/public_html/wp-includes/plugin.php(522): WP_Hook->do_action(Array) #15 /home/customer/www/staging2.swftconnect.com/public_html/wp-settings.php(764): do_action('wp_loaded') #16 /home/customer/www/staging2.swftconnect.com/public_html/wp-config.php(68): require_once('/home/customer/...') #17 /home/customer/www/staging2.swftconnect.com/public_html/wp-load.php(50): require_once('/home/customer/...') #18 /home/customer/www/staging2.swftconnect.com/public_html/wp-admin/admin.php(35): require_once('/home/customer/...') #19 /home/customer/www/staging2.swftconnect.com/public_html/wp-admin/plugin-install.php(16): require_once('/home/customer/...') #20 {main} thrown in /home/customer/www/staging2.swftconnect.com/public_html/wp-content/plugins/woocommerce-multilingual/inc/class-wcml-wc-gateways.php on line 117
Note that WooCommerce gateways should be WC_Payment_Gateway-compatible.
WooCommerce’s payment gateway API expects gateways to extend WC_Payment_Gateway.
Related documentation: hidden link
In the meantime I will also share this with our compatibility team, however, please let me know the feedback from the plugin's team as the bug is within their code and not due to WPML.
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