diff --git a/packages/core/src/Actions/Carts/AssociateUser.php b/packages/core/src/Actions/Carts/AssociateUser.php
index d798f83688..c113ad54c0 100644
--- a/packages/core/src/Actions/Carts/AssociateUser.php
+++ b/packages/core/src/Actions/Carts/AssociateUser.php
@@ -33,6 +33,7 @@ public function execute(Cart $cart, User $user, $policy = 'merge'): self
 
         $cart->update([
             'user_id' => $user->getKey(),
+            'customer_id' => $user->latestCustomer()?->getKey(),
         ]);
 
         return $this;
diff --git a/packages/core/src/Managers/CartSessionManager.php b/packages/core/src/Managers/CartSessionManager.php
index 5697c94089..c82c15ca69 100644
--- a/packages/core/src/Managers/CartSessionManager.php
+++ b/packages/core/src/Managers/CartSessionManager.php
@@ -234,10 +234,13 @@ public function createOrder($forget = true)
      */
     protected function createNewCart()
     {
+        $user = $this->authManager->user();
+
         $cart = Cart::create([
             'currency_id' => $this->getCurrency()->id,
             'channel_id' => $this->getChannel()->id,
-            'user_id' => $this->authManager->user()?->id,
+            'user_id' => optional($user)->id,
+            'customer_id' => optional($user)->latestCustomer()?->id,
         ]);
 
         return $this->use($cart);
diff --git a/tests/core/Unit/Actions/Carts/AssociateUserTest.php b/tests/core/Unit/Actions/Carts/AssociateUserTest.php
index b4ec4f39f5..ad3f0f37bc 100644
--- a/tests/core/Unit/Actions/Carts/AssociateUserTest.php
+++ b/tests/core/Unit/Actions/Carts/AssociateUserTest.php
@@ -35,6 +35,35 @@
     ]);
 });
 
+test('can associate a user with a customer', function () {
+    $currency = Currency::factory()->create();
+
+    $cart = Cart::factory()->create([
+        'currency_id' => $currency->id,
+    ]);
+
+    $this->assertDatabaseHas((new Cart)->getTable(), [
+        'user_id' => null,
+        'id' => $cart->id,
+        'merged_id' => null,
+    ]);
+
+    $action = new AssociateUser;
+
+    $user = User::factory()->create();
+    $customer = \Lunar\Models\Customer::factory()->create();
+    $user->customers()->attach($customer);
+
+    $action->execute($cart, $user);
+
+    $this->assertDatabaseHas((new Cart)->getTable(), [
+        'user_id' => $user->id,
+        'customer_id' => $customer->id,
+        'id' => $cart->id,
+        'merged_id' => null,
+    ]);
+});
+
 test('cant associate user to cart with order', function () {
     $currency = Currency::factory()->create();