Never rely on dynamic properties

Author: nicolas-grekas

Core/Exception/AuthenticationException.php

@@ -21,8 +21,17 @@
  */
 class AuthenticationException extends RuntimeException
 {
+    /** @internal */
+    protected $serialized;
+
     private $token;
 
+    public function __construct(string $message = '', int $code = 0, \Throwable $previous = null)
+    {
+        unset($this->serialized);
+        parent::__construct($message, $code, $previous);
+    }
+
     /**
      * Get the token.
      *

Core/Tests/Exception/CustomUserMessageAuthenticationExceptionTest.php

@@ -17,6 +17,8 @@
 
 class ChildCustomUserMessageAuthenticationException extends CustomUserMessageAuthenticationException
 {
+    public $childMember;
+
     public function __serialize(): array
     {
         return [$this->childMember, parent::__serialize()];