diff --git a/src/Http/Controllers/WebhookController.php b/src/Http/Controllers/WebhookController.php
index 7183fea..1ceb19b 100644
--- a/src/Http/Controllers/WebhookController.php
+++ b/src/Http/Controllers/WebhookController.php
@@ -157,6 +157,10 @@ protected function handleSubscriptionCreated(array $payload)
             throw new InvalidPassthroughPayload;
         }
 
+        if ($this->subscriptionExists($payload['subscription_id'])) {
+            return;
+        }
+
         $customer = $this->findOrCreateCustomer($payload['passthrough']);
 
         $trialEndsAt = $payload['status'] === Subscription::STATUS_TRIALING
@@ -278,6 +282,17 @@ protected function findSubscription(string $subscriptionId)
         return Cashier::$subscriptionModel::firstWhere('paddle_id', $subscriptionId);
     }
 
+    /**
+     * Determine if a subscription with a given Paddle ID already exists.
+     *
+     * @param  string  $subscriptionId
+     * @return bool
+     */
+    protected function subscriptionExists(string $subscriptionId)
+    {
+        return Cashier::$subscriptionModel::where('paddle_id', $subscriptionId)->exists();
+    }
+
     /**
      * Determine if a receipt with a given Order ID already exists.
      *
diff --git a/tests/Feature/WebhooksTest.php b/tests/Feature/WebhooksTest.php
index cff4781..c5fcebe 100644
--- a/tests/Feature/WebhooksTest.php
+++ b/tests/Feature/WebhooksTest.php
@@ -258,6 +258,50 @@ public function test_it_can_handle_a_subscription_created_event_if_billable_alre
         });
     }
 
+    public function test_it_can_handle_a_duplicated_subscription_created_event()
+    {
+        Cashier::fake();
+
+        $user = $this->createUser();
+
+        for ($i = 0; $i < 2; $i++) {
+            $this->postJson('paddle/webhook', [
+                'alert_name' => 'subscription_created',
+                'user_id' => 'foo',
+                'email' => $user->paddleEmail(),
+                'passthrough' => json_encode([
+                    'billable_id' => $user->id,
+                    'billable_type' => $user->getMorphClass(),
+                    'subscription_name' => 'main',
+                ]),
+                'quantity' => 1,
+                'status' => Subscription::STATUS_ACTIVE,
+                'subscription_id' => 'bar',
+                'subscription_plan_id' => 1234,
+            ])->assertOk();
+        }
+
+        $this->assertDatabaseHas('customers', [
+            'billable_id' => $user->id,
+            'billable_type' => $user->getMorphClass(),
+        ]);
+
+        $this->assertDatabaseHas('subscriptions', [
+            'billable_id' => $user->id,
+            'billable_type' => $user->getMorphClass(),
+            'name' => 'main',
+            'paddle_id' => 'bar',
+            'paddle_plan' => 1234,
+            'paddle_status' => Subscription::STATUS_ACTIVE,
+            'quantity' => 1,
+            'trial_ends_at' => null,
+        ]);
+
+        Cashier::assertSubscriptionCreated(function (SubscriptionCreated $event) use ($user) {
+            return $event->billable->id === $user->id && $event->subscription->paddle_plan === 1234;
+        });
+    }
+
     public function test_it_can_handle_a_subscription_updated_event()
     {
         Cashier::fake();