URL error

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I have a strange error I found out throug Gtmetrix.com https://gtmetrix.com/reports/easystartoffice.com/WmV01P8V/ (see the 301) error.

The problem is somehow the trustindex plugin generates a link? ”domain/&” and this gives a 404 error. So I had to make a 301 redirect (so at least it does not result in errors).

Any clue how to solve this?

https://easystartoffice.com/&