Yeah, I had a large number of these logs. I did report this issue months ago.

I see these events in a few portals. Most of them do not have HCC installed, therefore it seems more of an DNN related issue.

Reto, your answer is not useful, I manage more than one hundred websites built with DNN and I have hardly ever seen this exception before.
Instead in a clean installation of HCC, after a while I can find many.
Furthermore, as I have already written, I have ascertained that the exception is regularly generated in the passage from the Cart page to the Checkout page, so it's definitely something related to HCC.

Hi Scippy

I do apologise if my answer seemed unhelpful or like I would dismiss any influence of HCC.
Let me rephrase: From what I see in our logs, this problem does not seem to only affect HCC. There are more modules / scenarios where we see the same message.
Until now we were not able to pinpoint the exact reason behind. I see you have tracked it down (That is really helpful) and we will certainly try to investigate in this area too.

My comment was ment to provide additional information. We're all in the same boat, and english is not my first language, so it might sometimes not be perfectly on the point.

I really appreciate your effort you are putting into the HCC ecosystem!
Cheers, Reto