diff --git a/com_oauthserver/administrator/src/Event/AbstractImmutableEvent.php b/com_oauthserver/administrator/src/Event/AbstractImmutableEvent.php
new file mode 100644
index 0000000..169d29c
--- /dev/null
+++ b/com_oauthserver/administrator/src/Event/AbstractImmutableEvent.php
@@ -0,0 +1,114 @@
+<?php
+/**
+ * @package         Joomla.Administrator
+ * @subpackage      com_oauthserver
+ *
+ * @copyright   (c) 2024. Webmasterskaya. <https://webmasterskaya.xyz>
+ * @license         MIT; see LICENSE.txt
+ **/
+
+namespace Webmasterskaya\Component\OauthServer\Administrator\Event;
+
+abstract class AbstractImmutableEvent extends \Joomla\CMS\Event\AbstractImmutableEvent
+{
+    /**
+     * A flag to see if the constructor has been already called.
+     *
+     * @var    boolean
+     * @since  version
+     */
+    private bool $constructed = false;
+
+    /**
+     * Constructor.
+     *
+     * @param   string  $name       The event name.
+     * @param   array   $arguments  The event arguments.
+     *
+     * @throws  \BadMethodCallException
+     * @since        version
+     * @noinspection PhpMissingParentConstructorInspection
+     */
+    public function __construct(string $name, array $arguments = [])
+    {
+        if ($this->constructed)
+        {
+            throw new \BadMethodCallException(
+                sprintf('Cannot reconstruct the AbstractImmutableEvent %s.', $this->name)
+            );
+        }
+
+        $this->name      = $name;
+        $this->arguments = [];
+
+        foreach ($arguments as $argumentName => $value)
+        {
+            $this->setArgument($argumentName, $value);
+        }
+
+        $this->constructed = true;
+    }
+
+    public function setArgument($name, $value): AbstractImmutableEvent
+    {
+        if (!$this->constructed)
+        {
+            return parent::setArgument($name, $value);
+        }
+
+        throw new \BadMethodCallException(
+            sprintf(
+                'Cannot set the argument %s of the immutable event %s.',
+                $name,
+                $this->name
+            )
+        );
+    }
+
+    public function addArgument($name, $value): AbstractImmutableEvent
+    {
+        if (!$this->constructed)
+        {
+            return parent::addArgument($name, $value);
+        }
+
+        throw new \BadMethodCallException(
+            sprintf(
+                'Cannot add the argument %s of the immutable event %s.',
+                $name,
+                $this->name
+            )
+        );
+    }
+
+    public function removeArgument($name)
+    {
+        if (!$this->constructed)
+        {
+            return parent::removeArgument($name);
+        }
+
+        throw new \BadMethodCallException(
+            sprintf(
+                'Cannot remove the argument %s of the immutable event %s.',
+                $name,
+                $this->name
+            )
+        );
+    }
+
+    public function clearArguments(): array
+    {
+        if (!$this->constructed)
+        {
+            return parent::clearArguments();
+        }
+
+        throw new \BadMethodCallException(
+            sprintf(
+                'Cannot clear arguments of the immutable event %s.',
+                $this->name
+            )
+        );
+    }
+}