diff --git a/CRM/Batch/BAO/Batch.php b/CRM/Batch/BAO/Batch.php
index 3bb93f140b70..e9fea4c3fba1 100644
--- a/CRM/Batch/BAO/Batch.php
+++ b/CRM/Batch/BAO/Batch.php
@@ -119,7 +119,7 @@ public static function generateBatchName() {
    */
   public static function deleteBatch($batchId) {
     // delete entry from batch table
-    CRM_Utils_Hook::pre('delete', 'Batch', $batchId, CRM_Core_DAO::$_nullArray);
+    CRM_Utils_Hook::pre('delete', 'Batch', $batchId);
     $batch = new CRM_Batch_DAO_Batch();
     $batch->id = $batchId;
     $batch->delete();
diff --git a/CRM/Campaign/BAO/Campaign.php b/CRM/Campaign/BAO/Campaign.php
index 7800cf925d46..1aa324805ec5 100644
--- a/CRM/Campaign/BAO/Campaign.php
+++ b/CRM/Campaign/BAO/Campaign.php
@@ -84,7 +84,7 @@ public static function del($id) {
       return FALSE;
     }
 
-    CRM_Utils_Hook::pre('delete', 'Campaign', $id, CRM_Core_DAO::$_nullArray);
+    CRM_Utils_Hook::pre('delete', 'Campaign', $id);
 
     $dao = new CRM_Campaign_DAO_Campaign();
     $dao->id = $id;
diff --git a/CRM/Case/BAO/Case.php b/CRM/Case/BAO/Case.php
index 96a511e69bc9..9d7a008c8982 100644
--- a/CRM/Case/BAO/Case.php
+++ b/CRM/Case/BAO/Case.php
@@ -187,7 +187,7 @@ public static function getCaseType($caseId, $colName = 'title') {
    *   is successful
    */
   public static function deleteCase($caseId, $moveToTrash = FALSE) {
-    CRM_Utils_Hook::pre('delete', 'Case', $caseId, CRM_Core_DAO::$_nullArray);
+    CRM_Utils_Hook::pre('delete', 'Case', $caseId);
 
     //delete activities
     $activities = self::getCaseActivityDates($caseId);
diff --git a/CRM/Contact/BAO/Contact.php b/CRM/Contact/BAO/Contact.php
index 8d1095747eca..fb643f47c30f 100644
--- a/CRM/Contact/BAO/Contact.php
+++ b/CRM/Contact/BAO/Contact.php
@@ -3473,9 +3473,9 @@ public static function deleteObjectWithPrimary($type, $id) {
     $obj = new $daoName();
     $obj->id = $id;
     $obj->find();
-    $hookParams = [];
+
     if ($obj->fetch()) {
-      CRM_Utils_Hook::pre('delete', $type, $id, $hookParams);
+      CRM_Utils_Hook::pre('delete', $type, $id);
       $contactId = $obj->contact_id;
       $obj->delete();
     }
diff --git a/CRM/Contact/BAO/Group.php b/CRM/Contact/BAO/Group.php
index 5861b057571d..138fd9e2d3ed 100644
--- a/CRM/Contact/BAO/Group.php
+++ b/CRM/Contact/BAO/Group.php
@@ -55,7 +55,7 @@ public static function discard($id) {
     if (!$id || !is_numeric($id)) {
       throw new CRM_Core_Exception('Invalid group request attempted');
     }
-    CRM_Utils_Hook::pre('delete', 'Group', $id, CRM_Core_DAO::$_nullArray);
+    CRM_Utils_Hook::pre('delete', 'Group', $id);
 
     $transaction = new CRM_Core_Transaction();
 
diff --git a/CRM/Contact/BAO/Relationship.php b/CRM/Contact/BAO/Relationship.php
index 85a8f53822f1..8df124f1c4f3 100644
--- a/CRM/Contact/BAO/Relationship.php
+++ b/CRM/Contact/BAO/Relationship.php
@@ -717,7 +717,7 @@ public static function clearCurrentEmployer($id, $action) {
    */
   public static function del($id) {
     // delete from relationship table
-    CRM_Utils_Hook::pre('delete', 'Relationship', $id, CRM_Core_DAO::$_nullArray);
+    CRM_Utils_Hook::pre('delete', 'Relationship', $id);
 
     $relationship = self::clearCurrentEmployer($id, CRM_Core_Action::DELETE);
     $relationship->delete();
diff --git a/CRM/Contribute/BAO/Contribution.php b/CRM/Contribute/BAO/Contribution.php
index 554593609806..236c1c203e25 100644
--- a/CRM/Contribute/BAO/Contribution.php
+++ b/CRM/Contribute/BAO/Contribution.php
@@ -1491,7 +1491,7 @@ public static function getTotalAmountAndCount($status = NULL, $startDate = NULL,
    *   $results no of deleted Contribution on success, false otherwise
    */
   public static function deleteContribution($id) {
-    CRM_Utils_Hook::pre('delete', 'Contribution', $id, CRM_Core_DAO::$_nullArray);
+    CRM_Utils_Hook::pre('delete', 'Contribution', $id);
 
     $transaction = new CRM_Core_Transaction();
 
diff --git a/CRM/Core/BAO/UFGroup.php b/CRM/Core/BAO/UFGroup.php
index a79ee24ea5b3..fcf582ef6f66 100644
--- a/CRM/Core/BAO/UFGroup.php
+++ b/CRM/Core/BAO/UFGroup.php
@@ -1399,6 +1399,8 @@ public static function usedByModule($id) {
    *
    */
   public static function del($id) {
+    CRM_Utils_Hook::pre('delete', 'UFGroup', $id);
+
     //check whether this group contains  any profile fields
     $profileField = new CRM_Core_DAO_UFField();
     $profileField->uf_group_id = $id;
@@ -1416,6 +1418,8 @@ public static function del($id) {
     $group = new CRM_Core_DAO_UFGroup();
     $group->id = $id;
     $group->delete();
+
+    CRM_Utils_Hook::post('delete', 'UFGroup', $id, $group);
     return 1;
   }
 
diff --git a/CRM/Event/BAO/Event.php b/CRM/Event/BAO/Event.php
index 26bb7f276595..6adb77093daf 100644
--- a/CRM/Event/BAO/Event.php
+++ b/CRM/Event/BAO/Event.php
@@ -171,7 +171,7 @@ public static function del($id) {
       return NULL;
     }
 
-    CRM_Utils_Hook::pre('delete', 'Event', $id, CRM_Core_DAO::$_nullArray);
+    CRM_Utils_Hook::pre('delete', 'Event', $id);
 
     $extends = ['event'];
     $groupTree = CRM_Core_BAO_CustomGroup::getGroupDetail(NULL, NULL, $extends);
diff --git a/CRM/Event/BAO/Participant.php b/CRM/Event/BAO/Participant.php
index 9818d888988b..9c726376c9f5 100644
--- a/CRM/Event/BAO/Participant.php
+++ b/CRM/Event/BAO/Participant.php
@@ -843,7 +843,7 @@ public static function deleteParticipant($id) {
     if (!$participant->find()) {
       return FALSE;
     }
-    CRM_Utils_Hook::pre('delete', 'Participant', $id, CRM_Core_DAO::$_nullArray);
+    CRM_Utils_Hook::pre('delete', 'Participant', $id);
 
     $transaction = new CRM_Core_Transaction();
 
diff --git a/CRM/Grant/BAO/Grant.php b/CRM/Grant/BAO/Grant.php
index e203d546f558..bc33e04c8070 100644
--- a/CRM/Grant/BAO/Grant.php
+++ b/CRM/Grant/BAO/Grant.php
@@ -252,7 +252,7 @@ public static function deleteContact($id) {
    * @return bool|mixed
    */
   public static function del($id) {
-    CRM_Utils_Hook::pre('delete', 'Grant', $id, CRM_Core_DAO::$_nullArray);
+    CRM_Utils_Hook::pre('delete', 'Grant', $id);
 
     $grant = new CRM_Grant_DAO_Grant();
     $grant->id = $id;
diff --git a/CRM/Mailing/BAO/Mailing.php b/CRM/Mailing/BAO/Mailing.php
index 8a1e9529096e..f28c1f17f5ef 100644
--- a/CRM/Mailing/BAO/Mailing.php
+++ b/CRM/Mailing/BAO/Mailing.php
@@ -2463,7 +2463,7 @@ public static function del($id) {
       throw new CRM_Core_Exception(ts('No id passed to mailing del function'));
     }
 
-    CRM_Utils_Hook::pre('delete', 'Mailing', $id, CRM_Core_DAO::$_nullArray);
+    CRM_Utils_Hook::pre('delete', 'Mailing', $id);
 
     // delete all file attachments
     CRM_Core_BAO_File::deleteEntityFile('civicrm_mailing',
diff --git a/CRM/Mailing/BAO/MailingAB.php b/CRM/Mailing/BAO/MailingAB.php
index 7d26a2c1000a..e035ec696229 100644
--- a/CRM/Mailing/BAO/MailingAB.php
+++ b/CRM/Mailing/BAO/MailingAB.php
@@ -61,7 +61,7 @@ public static function del($id) {
       throw new CRM_Core_Exception(ts('No id passed to MailingAB del function'));
     }
     CRM_Core_Transaction::create()->run(function () use ($id) {
-      CRM_Utils_Hook::pre('delete', 'MailingAB', $id, CRM_Core_DAO::$_nullArray);
+      CRM_Utils_Hook::pre('delete', 'MailingAB', $id);
 
       $dao = new CRM_Mailing_DAO_MailingAB();
       $dao->id = $id;
diff --git a/CRM/Mailing/BAO/MailingJob.php b/CRM/Mailing/BAO/MailingJob.php
index 228406bb9965..020c65b7e16f 100644
--- a/CRM/Mailing/BAO/MailingJob.php
+++ b/CRM/Mailing/BAO/MailingJob.php
@@ -1122,7 +1122,7 @@ public static function findPendingTasks($jobId, $medium) {
    * @return mixed
    */
   public static function del($id) {
-    CRM_Utils_Hook::pre('delete', 'MailingJob', $id, CRM_Core_DAO::$_nullArray);
+    CRM_Utils_Hook::pre('delete', 'MailingJob', $id);
 
     $jobDAO = new CRM_Mailing_BAO_MailingJob();
     $jobDAO->id = $id;
diff --git a/CRM/PCP/BAO/PCP.php b/CRM/PCP/BAO/PCP.php
index 6fdd36d02753..9b6afa3dc580 100644
--- a/CRM/PCP/BAO/PCP.php
+++ b/CRM/PCP/BAO/PCP.php
@@ -340,7 +340,7 @@ public static function &pcpLinks($pcpId = NULL) {
    *   Campaign page id.
    */
   public static function deleteById($id) {
-    CRM_Utils_Hook::pre('delete', 'Campaign', $id, CRM_Core_DAO::$_nullArray);
+    CRM_Utils_Hook::pre('delete', 'Campaign', $id);
 
     $transaction = new CRM_Core_Transaction();
 
diff --git a/CRM/Pledge/BAO/Pledge.php b/CRM/Pledge/BAO/Pledge.php
index 9bc13cda3129..299e3ffa56b0 100644
--- a/CRM/Pledge/BAO/Pledge.php
+++ b/CRM/Pledge/BAO/Pledge.php
@@ -285,7 +285,7 @@ protected static function isPaymentsRequireRecalculation($params) {
    * @return mixed
    */
   public static function deletePledge($id) {
-    CRM_Utils_Hook::pre('delete', 'Pledge', $id, CRM_Core_DAO::$_nullArray);
+    CRM_Utils_Hook::pre('delete', 'Pledge', $id);
 
     $transaction = new CRM_Core_Transaction();
 
diff --git a/CRM/Pledge/BAO/PledgeBlock.php b/CRM/Pledge/BAO/PledgeBlock.php
index a3b80ff7d861..68304860c22e 100644
--- a/CRM/Pledge/BAO/PledgeBlock.php
+++ b/CRM/Pledge/BAO/PledgeBlock.php
@@ -93,7 +93,7 @@ public static function add($params) {
    * @return mixed|null
    */
   public static function deletePledgeBlock($id) {
-    CRM_Utils_Hook::pre('delete', 'PledgeBlock', $id, CRM_Core_DAO::$_nullArray);
+    CRM_Utils_Hook::pre('delete', 'PledgeBlock', $id);
 
     $transaction = new CRM_Core_Transaction();
 
diff --git a/CRM/Utils/Hook.php b/CRM/Utils/Hook.php
index 47233dd4bd7c..f173abac3bf2 100644
--- a/CRM/Utils/Hook.php
+++ b/CRM/Utils/Hook.php
@@ -339,7 +339,7 @@ public function requireCiviModules(&$moduleList) {
    * @return null
    *   the return value is ignored
    */
-  public static function pre($op, $objectName, $id, &$params) {
+  public static function pre($op, $objectName, $id, &$params = []) {
     $event = new \Civi\Core\Event\PreEvent($op, $objectName, $id, $params);
     \Civi::dispatcher()->dispatch('hook_civicrm_pre', $event);
     return $event->getReturnValues();
diff --git a/Civi/Api4/Generic/Traits/CustomValueActionTrait.php b/Civi/Api4/Generic/Traits/CustomValueActionTrait.php
index 2fed2b7f467c..5a7a0e331276 100644
--- a/Civi/Api4/Generic/Traits/CustomValueActionTrait.php
+++ b/Civi/Api4/Generic/Traits/CustomValueActionTrait.php
@@ -83,7 +83,7 @@ protected function deleteObjects($items) {
     $customTable = CoreUtil::getTableName($this->getEntityName());
     $ids = [];
     foreach ($items as $item) {
-      \CRM_Utils_Hook::pre('delete', $this->getEntityName(), $item['id'], \CRM_Core_DAO::$_nullArray);
+      \CRM_Utils_Hook::pre('delete', $this->getEntityName(), $item['id']);
       \CRM_Utils_SQL_Delete::from($customTable)
         ->where('id = #value')
         ->param('#value', $item['id'])