Error upgrading db while upgrading to 4.0.0-b1

Hello,

I have tried to upgrade matomo to version 4.0.0-b1.

I have have done the following:

• Backed up configuration and DB.
• Configured the maintenance mode and stop recording statistics.
• Downloaded and unzipped the matomo zip file.
• Used “./console core:update”.

This tasks ended in the following error:
Executing ALTER TABLE matomo_session CHANGE id id VARCHAR(191);…
[X] Critical Error during the update process:

* /opt/matomo/core/Updates/4.0.0-b1.php:
Error trying to execute the migration 'ALTER TABLE `matomo_session` CHANGE `id` `id` VARCHAR(191);'.
The error was: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry 'AQBqYXZhLnV0aWwuVHJlZU1h8AEBAW9yZy5hcGFjaGUuY29tbW9ucy5iZWFud...' for key 'PRIMARY'

Can anyone help me with this? I’ve done some research but I didnt found anything.
Thanks you in advance.

Best regards

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