No, it happens randomely.
Here are the orders affected, you can see they happen at different increments.
326
885
910
1653
1691
1717
Payment is done with Offline Credit Card Processing v1.2
And shipping is done with United States Postal Service v1.0.2
Default Store Pickup v1.0.1 & UPS 1.0.1

I don't it's strictly a user end issue since we had an order come in with one product affected and not the others.
It would be easier to do testing by taking things in and out (extensions and custom modifications) and see what's causing it, but I can't do that on a live site, so that's why I though fake bot orders on a test site would work.

So I have run into a strange bug that happens every few 100 orders and I had decided to use a bot on a cloned site to make purchases to see if I could debug the strange bug, but alas I ran into the No 'Access-Control-Allow-Origin' issue. Is there a way to disable this temporarily so that I can run my bot?
I am aware of the potential risks, but it's on cloned site that won't have any real data on it.
Thanks!

So I have an site set up for a client and I received a message that an order was missing options although the customer did select them and the options were required.
This is the second time this has happened and I could not figure out why. We simply got the options from the customer again the first time but this time I noticed something odd.
The error log was packed full of mostly blank errors (image attached) and occasionally these.

App Error: AbanteCart core v.1.2.12 Error: Error in data of page with controller: 'pages/product/category'. Please check for key_value present where key_param was set.
Requested URL: http://website.net/index.php?rt=product/category&path=21_84%20or%20(1,2)=(select*from(select%20name_const(CHAR(111,108,111,108,111,115,104,101,114),1),name_const(CHAR(111,108,111,108,111,115,104,101,114),1))a)%20--%20and%201%3D1
Referer URL: in /home/website/public_html/core/engine/layout.php on line 193

warning: AbanteCart core v.1.2.12 is_dir() expects parameter 1 to be a valid path, string given in <b>/home/website/public_html/core/engine/router.php</b> on line <b>250</b>

warning: AbanteCart core v.1.2.12 is_file() expects parameter 1 to be a valid path, string given in <b>/home/website/public_html/core/engine/router.php</b> on line <b>256</b>

I have never seen these errors before and I'm not sure when they started. I plan on updating the site in hopes that it fixes the issue, but if anyone know why these errors and the option glitch are occurring, that would be great.

Here are my installation details:
Abantecart v.1.2.12
Aside from the default extensions, here are the other ones:
Offline Credit Card Processing 1.2
Calendar 1.2.6.3
Enhanced Option Pricing Display With Link Pro 1.2.2.4
Mass Edit 0.6.0 (This is my own extension, but it doesn't make any changes in orders so I don't think its a valid suspect.)
There are about 2400 products on the site and about 1400 orders already made.

[EDIT]
None of the extensions seem to be responsible as I have disabled each individually and the blank errors are still appearing.
Also I don't have any cron jobs running, it seems to create the error every time someone accesses a page.

Now I am receiving different errors.
 AbanteCart core v.1.2.13 Call to a member function model() on null in ######


Does anyone know of any useful tutorials for making extensions in Abantecart? The developer's guide provided is very limited.

Hi,
I know this thread is a bit old, but I had a similar question for an extension I am working on.
I am trying to call a function from a different model to delete a product, but as soon as I use that syntax, everything breaks.

$this->load->model('catolog/product');
        $this->model_catalog_product->deleteProduct((int)$id);
Error:
load error: AbanteCart core v.1.2.13 Error: Could not load model catolog/product from /home/####/####.com/####/extensions/####/admin/model/catalog/####.php on line 47 in <b>/home/####/####.com/####/core/engine/loader.php</b> on line <b>120</b>

Am I doing something wrong?

This may or may not help your situation, but it may be worth a try.
http://marketplace.abantecart.com/mass_edit

Thank you for sharing.

Yup, hope it helped in some way shape or form.