Product_Variable_Placeholder issue

Hi,

since last update of Woocommerce I get this message on dashboards of all the shops I manage::

Warning: Declaration of ET_Theme_Builder_Woocommerce_Product_Variable_Placeholder::get_available_variations() should be compatible with WC_Product_Variable::get_available_variations($return = ‘array’) in [domain]/wp-content/themes/Divi/includes/builder/frontend-builder/theme-builder/WoocommerceProductVariablePlaceholder.php on line 199

Could you please help me?