diff --git a/src/Cart.php b/src/Cart.php
index 369bb2e..60937f4 100644
--- a/src/Cart.php
+++ b/src/Cart.php
@@ -831,7 +831,7 @@ class Cart
      */
     private function storedCartWithIdentifierExists($identifier)
     {
-        return $this->getConnection()->table($this->getTableName())->where('identifier', $identifier)->exists();
+        return $this->getConnection()->table($this->getTableName())->where('identifier', $identifier)->where('instance', $this->currentInstance())->exists();
     }
 
     /**