Today I tried to create a new mySql database on my Dokku container using

dokku mysql:create bookmarks

The container has been created, but it seems it is unable to start.
The command

dokku mysql:list

always shows

NAME               VERSION       STATUS      EXPOSED PORTS  LINKS
bookmarks          mysql:5.6.26  restarting  -              -

I am unable to stop, restart or destroy this DB.

dokku mysql:destroy bookmarks
 !     WARNING: Potentially Destructive Action
 !     This command will destroy bookmarks MySQL service.
 !     To proceed, type "bookmarks"

> bookmarks
-----> Deleting bookmarks
       Deleting container data
 !     Service is already stopped
       Removing container
Error response from daemon: Conflict, You cannot remove a running container. Stop the container before attempting removal or use -f
Error: failed to remove containers: [dokku.mysql.bookmarks]

I also tried to reboot the entire droplet, without any success.
Can anyone help me solving this problem?
Thank you in advance,
Simone