One-Page Checkout [Support Thread]

[lat9]

Guest Checkout with OPC - PHP 7.4 and Zen Cart 1.5.7c, OPC 2.4.5 (2022-12-27). Has anyone else seen this? Happens once in a while, not consistently.

[14-May-2023 21:32:45 UTC] PHP Notice: Malformed value for session-based shipping module; customer will need to re-select: {"id":"","title":"United Parcel Service (UPS Ground)","cost":35.76100000000000278532752417959272861480712890625} in /home/client/public_html/includes/classes/order.php on line 323

I've seen that, usually on the shopping-cart page, when a shipping method like UPS or USPS can't ship to the customer's selected country/state; nothing IMO to do with OPC.