Logger code breaking WooCommerce Checkout

I found and corrected this problem, but I may have done it wrong. Let me know if this works for you:

/post-smtp/postman/postman-email-log/PostmanEmailLogService.php Line 154

Replace this:
$this->logger->debug( sprintf( ‘Saved message #%s to the database’, $post_id ) );
with this:
$this->logger->debug( sprintf( ‘Saved message #%b to the database’, $post_id ) );

WooCommerce checkout would give a black error when trying to checkout on our website. I found and tweaked this code, and now it works.