diff --git a/src/Cart.php b/src/Cart.php
index 60937f4..4b1eb8a 100644
--- a/src/Cart.php
+++ b/src/Cart.php
@@ -98,7 +98,7 @@ class Cart
             $instance = $instance->getInstanceIdentifier();
         }
 
-        $this->instance = 'cart.'.$instance;
+        $this->instance = 'cart.' . $instance;
 
         return $this;
     }
@@ -831,7 +831,11 @@ class Cart
      */
     private function storedCartWithIdentifierExists($identifier)
     {
-        return $this->getConnection()->table($this->getTableName())->where('identifier', $identifier)->where('instance', $this->currentInstance())->exists();
+        $data = ['identifier' => $identifier];
+        if ($this->countInstances() > 1) {
+            $data['instance'] = $this->currentInstance();
+        }
+        return $this->getConnection()->table($this->getTableName())->where($data)->exists();
     }
 
     /**
diff --git a/tests/CartTest.php b/tests/CartTest.php
index 0e45315..c2a0bd4 100644
--- a/tests/CartTest.php
+++ b/tests/CartTest.php
@@ -65,7 +65,7 @@ class CartTest extends TestCase
         parent::setUp();
 
         $this->app->afterResolving('migrator', function ($migrator) {
-            $migrator->path(realpath(__DIR__.'/../src/Database/migrations'));
+            $migrator->path(realpath(__DIR__ . '/../src/Database/migrations'));
         });
     }
 
@@ -1011,7 +1011,7 @@ class CartTest extends TestCase
         $cart = $this->getCartDiscount(50);
         $cart->add(new BuyableProduct(1, 'First item', 10.00), 1);
 
-        $cart->update('027c91341fd5cf4d2579b49c4b6a90da', ['qty'=>2]);
+        $cart->update('027c91341fd5cf4d2579b49c4b6a90da', ['qty' => 2]);
 
         $cartItem = $cart->get('027c91341fd5cf4d2579b49c4b6a90da');
 
@@ -1453,4 +1453,36 @@ class CartTest extends TestCase
         $this->app['config']->set('cart.format.decimal_point', $decimalPoint);
         $this->app['config']->set('cart.format.thousand_separator', $thousandSeperator);
     }
+
+    /** @test */
+    public function it_can_store__mutiple_instances_of_the_cart_in_a_database()
+    {
+        $this->artisan('migrate', [
+            '--database' => 'testing',
+        ]);
+
+        Event::fake();
+
+        $cart = $this->getCart();
+
+        $cart->add(new BuyableProduct());
+
+        $cart->store($identifier = 123);
+
+        $serialized = serialize($cart->content());
+
+        $newInstance = $this->getCart();
+        $newInstance->instance($instanceName = 'someinstance');
+        $newInstance->add(new BuyableProduct());
+        $newInstance->store($newIdentifier = 456);
+        $newInstanceSerialized = serialize($newInstance->content());
+
+        $this->assertDatabaseCount('shoppingcart', 2);
+
+        $this->assertDatabaseHas('shoppingcart', ['identifier' => $identifier, 'instance' => 'default', 'content' => $serialized]);
+
+        $this->assertDatabaseHas('shoppingcart', ['identifier' => $newIdentifier, 'instance' => $instanceName, 'content' => $newInstanceSerialized]);
+
+        Event::assertDispatched('cart.stored');
+    }
 }