diff --git a/Models/InterfaceManager.php b/Models/InterfaceManager.php
index 4f847a1..c5a40ac 100755
--- a/Models/InterfaceManager.php
+++ b/Models/InterfaceManager.php
@@ -35,7 +35,7 @@ class InterfaceManager
      * @var int
      * @since 1.0.0
      */
-    private int $id = 0;
+    protected int $id = 0;
 
     /**
      * File path.
diff --git a/Models/NullExchangeLog.php b/Models/NullExchangeLog.php
index 3a89588..3692849 100755
--- a/Models/NullExchangeLog.php
+++ b/Models/NullExchangeLog.php
@@ -24,4 +24,16 @@ namespace Modules\Exchange\Models;
  */
 final class NullExchangeLog extends ExchangeLog
 {
+	/**
+     * Constructor
+     *
+     * @param int $id Model id
+     *
+     * @since 1.0.0
+     */
+    public function __construct(int $id = 0)
+    {
+        $this->id = $id;
+        parent::__construct();
+    }
 }
diff --git a/Models/NullInterfaceManager.php b/Models/NullInterfaceManager.php
index 13cb3b4..4d4c55a 100755
--- a/Models/NullInterfaceManager.php
+++ b/Models/NullInterfaceManager.php
@@ -24,4 +24,16 @@ namespace Modules\Exchange\Models;
  */
 final class NullInterfaceManager extends InterfaceManager
 {
+	/**
+     * Constructor
+     *
+     * @param int $id Model id
+     *
+     * @since 1.0.0
+     */
+    public function __construct(int $id = 0)
+    {
+        $this->id = $id;
+        parent::__construct();
+    }
 }
diff --git a/tests/Models/NullExchangeLogTest.php b/tests/Models/NullExchangeLogTest.php
new file mode 100644
index 0000000..f0998e8
--- /dev/null
+++ b/tests/Models/NullExchangeLogTest.php
@@ -0,0 +1,42 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 8.0
+ *
+ * @package   tests
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace Modules\Exchange\tests\Models;
+
+use Modules\Exchange\Models\NullExchangeLog;
+
+/**
+ * @internal
+ */
+final class NullExchangeLogTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\Exchange\Models\NullExchangeLog
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\Exchange\Models\ExchangeLog', new NullExchangeLog());
+    }
+
+    /**
+     * @covers Modules\Exchange\Models\NullExchangeLog
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullExchangeLog(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullInterfaceManagerTest.php b/tests/Models/NullInterfaceManagerTest.php
new file mode 100644
index 0000000..63e6d2b
--- /dev/null
+++ b/tests/Models/NullInterfaceManagerTest.php
@@ -0,0 +1,42 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 8.0
+ *
+ * @package   tests
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace Modules\Exchange\tests\Models;
+
+use Modules\Exchange\Models\NullInterfaceManager;
+
+/**
+ * @internal
+ */
+final class NullInterfaceManagerTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\Exchange\Models\NullInterfaceManager
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\Exchange\Models\InterfaceManager', new NullInterfaceManager());
+    }
+
+    /**
+     * @covers Modules\Exchange\Models\NullInterfaceManager
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullInterfaceManager(2);
+        self::assertEquals(2, $null->getId());
+    }
+}