Symptoms
In the list of reports there are many reports with the exceptions:
No Subscription Period #0 registered in system.
Table Service Plan doesn't contain row with id 0.
The source of exception is failed API, called from on-line store.
How to eliminate these calls?
Cause
The root cause of the issue is due to web bots crawling the site and trying to index the site with no session. The bot has no cookies and after redirects it has no a planID in the session.
Resolution
The issue is fixed in scope of the bug #PBA-78626 ("0x85c20417 - Table $1 doesn't contain row with id $2"), fixed in OSA 7.1, online store starts handling connections without the sessions properly.