Continuous warnings from Malwarebytes

[rkr3]

Since a recent update of Vivaldi and/or Malwarebytes, I keep getting the following errors from Malwarebytes on a regular basis:

 

Website blocked due to riskware
If you don't want to block this website, you can exclude it from
website protection by accessing Exclusions.

Domain : backend.chatgptbygoogle.com
IP Address : 65.20.73.40
Port : 443
Type : Outbound
File : C:\Program Files\Vivaldi\Application\vivaldi.exe

 

It sometimes goes away for a few hours if I manually update Malwarebytes, but then returns.

I'm using Windows 11 Pro 23H2, with Vivaldi.

What do I need to do to fix this?