diff --git a/classes/pref/feeds.php b/classes/pref/feeds.php
index ec6abf9dd..47479e124 100755
--- a/classes/pref/feeds.php
+++ b/classes/pref/feeds.php
@@ -1289,7 +1289,7 @@ class Pref_Feeds extends Handler_Protected {
 	/**
 	 * @param array<string, mixed> $cat
 	 */
-	private function calculate_children_count(?array $cat): int {
+	private function calculate_children_count(array $cat): int {
 		$c = 0;
 
 		foreach ($cat['items'] ?? [] as $child) {