I want to upgrade my site (Drupal 7.54 to 7.55, then civicrm 4.7.16 to 4.7.20).
No problem on Drupal upgrade.
But for CiviCRM, when I run mysite/drupal/?q=civicrm/upgrade&reset=1 (after having replaced sites/all/civicrm directory content) :
- upgrade to 4.7.17 runs OK
- upgrade to 4.7.18 fails with the following error :
(BTW, civicrm_case table is empty on my site)