I have same issue, but I am unsure what creates it.
I have menu items for registered users, tried to disable them, no change.
I am using ARTIO Jomsef. Checked the links, I didn't find that those would be messed up.
Any suggestions what to look for?
P.S. Perhaps it is worth mentioning that I migrated the shopper fields from VM 1. Perhaps I need to add some shpper fields registration to work.
When I deleted the menu items as Patricck suggested, I have another wrror - feld name is not filled...
Also, I use site in one languge frontend (Latvian), but I have 3 installed, and am using English backend.
I have Joomla 3.4.5 Stable on v5.6.15 PHP with VM 3.0.12.