diff --git a/wp-includes/sqlite-ast/class-wp-sqlite-information-schema-exception.php b/wp-includes/sqlite-ast/class-wp-sqlite-information-schema-exception.php
index efa96ac49..361a7854a 100644
--- a/wp-includes/sqlite-ast/class-wp-sqlite-information-schema-exception.php
+++ b/wp-includes/sqlite-ast/class-wp-sqlite-information-schema-exception.php
@@ -39,7 +39,7 @@ public function __construct(
 		string $type,
 		string $message,
 		array $data = array(),
-		Throwable $previous = null
+		?Throwable $previous = null
 	) {
 		parent::__construct( $message, 0, $previous );
 		$this->type = $type;