• 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.

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