4 files changed, 4 insertions, 4 deletions
diff --git a/lib/private/Files/Node/Folder.php b/lib/private/Files/Node/Folder.php
index 014b66fdf63..52e7b55676a 100644
--- a/lib/private/Files/Node/Folder.php
+++ b/lib/private/Files/Node/Folder.php
@@ -199,7 +199,7 @@ class Folder extends Node implements \OCP\Files\Folder {
 		throw new NotPermittedException('No create permission for path "' . $path . '"');
 	}
 
-	private function queryFromOperator(ISearchOperator $operator, string $uid = null, int $limit = 0, int $offset = 0): ISearchQuery {
+	private function queryFromOperator(ISearchOperator $operator, ?string $uid = null, int $limit = 0, int $offset = 0): ISearchQuery {
 		if ($uid === null) {
 			$user = null;
 		} else {
diff --git a/lib/private/Files/Node/LazyFolder.php b/lib/private/Files/Node/LazyFolder.php
index 4aae5cf9804..08e77d7f705 100644
--- a/lib/private/Files/Node/LazyFolder.php
+++ b/lib/private/Files/Node/LazyFolder.php
@@ -101,7 +101,7 @@ class LazyFolder implements Folder {
 	/**
 	 * @inheritDoc
 	 */
-	public function removeListener($scope = null, $method = null, callable $callback = null) {
+	public function removeListener($scope = null, $method = null, ?callable $callback = null) {
 		$this->__call(__FUNCTION__, func_get_args());
 	}
 
diff --git a/lib/private/Files/Node/Node.php b/lib/private/Files/Node/Node.php
index acd91c56d3f..9f1a1e357e9 100644
--- a/lib/private/Files/Node/Node.php
+++ b/lib/private/Files/Node/Node.php
@@ -124,7 +124,7 @@ class Node implements INode {
 	/**
 	 * @param string[] $hooks
 	 */
-	protected function sendHooks($hooks, array $args = null) {
+	protected function sendHooks($hooks, ?array $args = null) {
 		$args = !empty($args) ? $args : [$this];
 		/** @var IEventDispatcher $dispatcher */
 		$dispatcher = \OC::$server->get(IEventDispatcher::class);
diff --git a/lib/private/Files/Node/Root.php b/lib/private/Files/Node/Root.php
index 71bc7a6da6b..7c3ff1d2867 100644
--- a/lib/private/Files/Node/Root.php
+++ b/lib/private/Files/Node/Root.php
@@ -137,7 +137,7 @@ class Root extends Folder implements IRootFolder {
 	 * @param string $method optional
 	 * @param callable $callback optional
 	 */
-	public function removeListener($scope = null, $method = null, callable $callback = null) {
+	public function removeListener($scope = null, $method = null, ?callable $callback = null) {
 		$this->emitter->removeListener($scope, $method, $callback);
 	}