Mysqli statement execute error : Duplicate entry '' for key 'unique_token'

@Janis wrote:

I’ve recently stopped to receive my EMail notifications so I checked the dashboard and saw that the system stopped tracking altogether. I did the update for Matomo and updated everything on the server.
This is the current version:
Matomo-Version: 3.6.0
MySQL-Version: 5.7.23-0ubuntu0.16.04.1
PHP-Version: 7.0.30-0ubuntu0.16.04.1

Now the system is tracking again, but when I want to send the tracking Email manually I receive the follwing error:

Mysqli statement execute error : Duplicate entry ‘’ for key ‘unique_token’

https://imgur.com/qWVXxFl

I have literally no clue what that means. So somebody please help me please

Thank you!

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