diff --git a/src/Parser.php b/src/Parser.php
index f09a210d6..5028fbf6a 100644
--- a/src/Parser.php
+++ b/src/Parser.php
@@ -595,12 +595,12 @@ public function parse()
      * Creates a new error log.
      *
      * @param string $msg   the error message
-     * @param Token  $token the token that produced the error
+     * @param Token|null  $token the token that produced the error
      * @param int    $code  the code of the error
      *
      * @throws ParserException throws the exception, if strict mode is enabled
      */
-    public function error($msg, Token $token = null, $code = 0)
+    public function error($msg, ?Token $token = null, $code = 0)
     {
         $error = new ParserException(
             Translator::gettext($msg),
diff --git a/src/Statement.php b/src/Statement.php
index 4b47ea5f8..b8a014f88 100644
--- a/src/Statement.php
+++ b/src/Statement.php
@@ -84,10 +84,10 @@ abstract class Statement
     /**
      * Constructor.
      *
-     * @param Parser     $parser the instance that requests parsing
-     * @param TokensList $list   the list of tokens to be parsed
+     * @param Parser|null     $parser the instance that requests parsing
+     * @param TokensList|null $list   the list of tokens to be parsed
      */
-    public function __construct(Parser $parser = null, TokensList $list = null)
+    public function __construct(?Parser $parser = null, ?TokensList $list = null)
     {
         if (($parser !== null) && ($list !== null)) {
             $this->parse($parser, $list);