From 84a16ce69ae8b8880b2f3ff4e86fbedbe18348fe Mon Sep 17 00:00:00 2001
From: "Dylan K. Taylor" <dktapps@pmmp.io>
Date: Fri, 21 Apr 2023 16:19:06 +0100
Subject: [PATCH] HandlerList: fixed crash on getting unused priority these
 sub-arrays are no longer allocated if no handlers are registered.

fixes #5713
---
 src/event/HandlerList.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/event/HandlerList.php b/src/event/HandlerList.php
index 692e8ac70..efbb20a1b 100644
--- a/src/event/HandlerList.php
+++ b/src/event/HandlerList.php
@@ -102,7 +102,7 @@ class HandlerList{
 	 * @return RegisteredListener[]
 	 */
 	public function getListenersByPriority(int $priority) : array{
-		return $this->handlerSlots[$priority];
+		return $this->handlerSlots[$priority] ?? [];
 	}
 
 	public function getParent() : ?HandlerList{