Uninstall error

I encounter a problem trying to uninstall the module, the problem appears more specifically when trying to uninstall invite_by_email.

Uninstall from the UI:
After clicking the "Uninstall" confirmation button to uninstall invite_by_email sub-module, the next page to load is the status report page (without any error message). Then, when returning and refreshing the uninstall page, the sub-module is still listed, not uninstalled.

Uninstall with Drush:
After drush pm-uninstall invite_by_email, a cron run is started and ends the command without uninstalling the sub-module.

[~/public_html/drupal]# drush pm-uninstall invite_by_email
The following modules will be uninstalled: invite_by_email
Do you really want to continue? (y/n): y
Cron channel default run started.
Cron job simplenews_cron started.
Cron job simplenews_cron ended in 0 secs.
Cron job queue_views_bulk_operations started.
Cron job queue_views_bulk_operations ended in 0 secs.
Cron channel default run completed.
[~/public_html/drupal]#

or when all cron jobs are done :

[~/public_html/drupal]# drush pm-uninstall invite_by_email -y
The following modules will be uninstalled: invite_by_email
Do you really want to continue? (y/n): y
No channels ready to be executed, skipping cron.
[~/public_html/drupal]#

The invite_notifications sub-module can be uninstalled without problem, but the uninstalled invite_by_email sub-module prevents uninstalling the main invite module.

Thanks for your help!