must be of the type string, null returned

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Hello. Upon updating the WooCommerce PayPal Checkout Gateway plugin to your latest
WooCommerce PayPal Payments I got fatal error on checkout.

Fatal error: Uncaught Error: Return value of WooCommerce\PayPalCommerce\WcGateway\Settings\SettingsRenderer::render_multiselect() must be of the type string, null returned
in …\plugins\woocommerce-paypal-payments\modules\ppcp-wc-gateway\src\Settings\class-settingsrenderer.php on line 208