In
public function sanitize_email_template
I changed
remove_action(‘woocommerce_email_header’, array($class, ’email_header’));
to this
remove_action(‘woocommerce_email_header’, array($class, ‘woocommerce_email_header’));
And now it works – but:
My theme uses plugin “WooCommerce Email Template Customizer” – and I have option to customize this email with plugin, but this customized email is not sended – only default woocommerce email.
But it’s on theme creator side, so, I will write to him.