diff --git a/app/Controllers/Customers.php b/app/Controllers/Customers.php
index b3bc72304..664800cab 100644
--- a/app/Controllers/Customers.php
+++ b/app/Controllers/Customers.php
@@ -232,7 +232,7 @@ class Customers extends Persons
         ];
 
         if ($this->customer->saveCustomer($personData, $customerData, $customerId)) {
-            Events::trigger('customer_saved', $customerData['person_id']);
+            Events::trigger('customer_saved', [$customerData['person_id']]);
 
             // New customer
             if ($customerId == NEW_ENTRY) {
@@ -287,7 +287,7 @@ class Customers extends Persons
     }
 
     /**
-     * This deletes customers from the customers table
+     * This deletes customers from the customer's table
      * @return ResponseInterface
      */
     public function postDelete(): ResponseInterface
@@ -354,6 +354,7 @@ class Customers extends Persons
                 $rowNumber = 1;
 
                 $failCodes = [];
+                $customerIds = [];
 
                 while (($data = fgetcsv($handle)) !== false) {
                     $consent = $data[3] == '' ? 0 : 1;
@@ -401,8 +402,7 @@ class Customers extends Persons
                         $failCodes[] = $rowNumber;
                         log_message('error', "Row $rowNumber was not imported: Either email or account number already exist or data was invalid.");
                     } elseif ($this->customer->saveCustomer($personData, $customerData)) {
-                        Events::trigger('customer_saved', $customerData['person_id']);
-
+                        $customerIds[] = $customerData['person_id'];
                     } else {
                         $failCodes[] = $rowNumber;
                     }
@@ -415,6 +415,8 @@ class Customers extends Persons
 
                     return $this->response->setJSON(['success' => false, 'message' => $message]);
                 } else {
+                    Events::trigger('customer_saved', $customerIds);
+
                     return $this->response->setJSON(['success' => true, 'message' => lang('Customers.csv_import_success')]);
                 }
             } else {
diff --git a/app/Plugins/MailchimpPlugin/MailchimpPlugin.php b/app/Plugins/MailchimpPlugin/MailchimpPlugin.php
index 3d62faf9d..e301953f3 100644
--- a/app/Plugins/MailchimpPlugin/MailchimpPlugin.php
+++ b/app/Plugins/MailchimpPlugin/MailchimpPlugin.php
@@ -190,29 +190,31 @@ class MailchimpPlugin extends BasePlugin
         echo $this->renderView('customer_tab', $viewData);
     }
 
-    public function onCustomerSaved(int $customerId): void
+    public function onCustomerSaved(array $customerIds): void
     {
         if (!$this->shouldSyncOnSave()) {
             return;
         }
 
-        log_message('debug', "Customer saved event received for ID: {$customerId}");
-
         $customerModel = new Customer();
-        $customer = $customerModel->getInfo($customerId);
 
-        $subscriptionStatus = !empty($customer->consent)
-            ? strtolower(SubscriptionStatus::SUBSCRIBED->name)
-            : strtolower(SubscriptionStatus::UNSUBSCRIBED->name);
+        foreach ($customerIds as $customerId) {
+            log_message('debug', "Customer saved event received for ID: {$customerId}");
 
-        $personData = [
-            'email'      => $customer->email ?? '',
-            'first_name' => $customer->first_name ?? '',
-            'last_name'  => $customer->last_name ?? '',
-        ];
-        $customerData = ['person_id' => $customerId];
+            $customer = $customerModel->getInfo($customerId);
 
-        $this->mailchimpLibrary->synchronizeSubscription($personData, $customerData, $subscriptionStatus);
+            $subscriptionStatus = !empty($customer->consent)
+                ? strtolower(SubscriptionStatus::SUBSCRIBED->name)
+                : strtolower(SubscriptionStatus::UNSUBSCRIBED->name);
+
+            $personData = [
+                'email'      => $customer->email ?? '',
+                'first_name' => $customer->first_name ?? '',
+                'last_name'  => $customer->last_name ?? '',
+            ];
+
+            $this->mailchimpLibrary->synchronizeSubscription($personData, ['person_id' => $customerId], $subscriptionStatus);
+        }
     }
 
     public function onCustomerDeleted(int $customerId, string $email): void