'title' => ts('Reference Date'),
'description' => ts('Stores the date from the entity which triggered this reminder action (e.g. membership.end_date for most membership renewal reminders)'),
'where' => 'civicrm_action_log.reference_date',
- 'default' => 'NULL',
+ 'default' => NULL,
'table_name' => 'civicrm_action_log',
'entity' => 'ActionLog',
'bao' => 'CRM_Core_BAO_ActionLog',