Removing self hosted runner from deleted repository

Hi everyone,

for testing purposes I setup a self hosted runner on a machine for a test repository.
After some tests I deleted the repository without unregistering the runner first.

If I try to setup the runner for another repository I get the message that the runner is already registered and I should run remove first.
If I run remove then I’m asked to input a removal token which I have not access to because the repository for that runner does not exist anymore.

Is there any way to unregister the runner without waiting for 30 days after which it is unregistered because of inactivity?