diff --git a/CHANGELOG.md b/CHANGELOG.md
index e75acf4110..b9ccad3de7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Release Notes for Craft Commerce
 
+## 4.5.1 - 2024-02-29
+
+- Fixed a SQL error that could occur when updating to Commerce 4 on MySQL. ([#3388](https://github.com/craftcms/commerce/pull/3388))
+- Fixed a bug where `craft\commerce\services\Carts::getHasSessionCartNumber()` wasn’t checking the cart cookie. ([#3353](https://github.com/craftcms/commerce/issues/3353))
+- Fixed a bug where it wasn’t possible to submit a blank variant title on the Edit Product page. ([#3384](https://github.com/craftcms/commerce/issues/3384))
+
 ## 4.5.0 - 2024-02-26
 
 - Removed the Lite edition.
diff --git a/src/console/controllers/UpgradeController.php b/src/console/controllers/UpgradeController.php
index 0870cc7bed..d615de1418 100644
--- a/src/console/controllers/UpgradeController.php
+++ b/src/console/controllers/UpgradeController.php
@@ -888,32 +888,32 @@ private function _migrateAddresses()
 WHERE NOT EXISTS (
   SELECT 1
   FROM $ordersTable AS o1
-  WHERE o1."v3billingAddressId" = a.id
+  WHERE [[o1.v3billingAddressId]] = a.id
 )
 AND NOT EXISTS (
   SELECT 1
   FROM $ordersTable AS o2
-  WHERE o2."v3shippingAddressId" = a.id
+  WHERE [[o2.v3shippingAddressId]] = a.id
 )
 AND NOT EXISTS (
   SELECT 1
   FROM $ordersTable AS o2
-  WHERE o2."v3estimatedBillingAddressId" = a.id
+  WHERE [[o2.v3estimatedBillingAddressId]] = a.id
 )
 AND NOT EXISTS (
   SELECT 1
   FROM $ordersTable AS o2
-  WHERE o2."v3shippingAddressId" = a.id
+  WHERE [[o2.v3shippingAddressId]] = a.id
 )
 AND NOT EXISTS (
   SELECT 1
   FROM $ordersTable AS o2
-  WHERE o2."v3estimatedShippingAddressId" = a.id
+  WHERE [[o2.v3estimatedShippingAddressId]] = a.id
 )
 AND NOT EXISTS (
   SELECT 1
   FROM $customersAddressesTable AS ca
-  WHERE ca."addressId" = a.id
+  WHERE [[ca.addressId]] = a.id
 );
 SQL;
 
diff --git a/src/helpers/Product.php b/src/helpers/Product.php
index 30037520e9..d33733063f 100644
--- a/src/helpers/Product.php
+++ b/src/helpers/Product.php
@@ -65,7 +65,7 @@ public static function populateProductVariantModel(ProductModel $product, $varia
             $variantModel->setFieldValues($variant['fields']);
         }
 
-        if (!empty($variant['title'])) {
+        if (isset($variant['title'])) {
             $variantModel->title = $variant['title'];
         }
 
diff --git a/src/services/Carts.php b/src/services/Carts.php
index 28e0662d48..ca5e149cf1 100644
--- a/src/services/Carts.php
+++ b/src/services/Carts.php
@@ -253,7 +253,18 @@ public function getCartName(): string
      */
     public function getHasSessionCartNumber(): bool
     {
-        return $this->_cartNumber !== null && $this->_cartNumber !== false;
+        if ($this->_cartNumber === false) {
+            return false;
+        }
+
+        if ($this->_cartNumber === null) {
+            $request = Craft::$app->getRequest();
+            $requestCookies = $request->getCookies();
+
+            return $requestCookies->getValue($this->cartCookie['name'], false) !== false;
+        }
+
+        return true;
     }
 
     /**