From 62f652a91e7e360292bd578ada16358e11626f41 Mon Sep 17 00:00:00 2001
From: MartkCz <martk494@gmail.com>
Date: Wed, 17 Sep 2025 11:13:43 +0200
Subject: [PATCH] Handle empty message queue in CachePoolStore::pop()

---
 src/Server/Transport/Sse/Store/CachePoolStore.php | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/Server/Transport/Sse/Store/CachePoolStore.php b/src/Server/Transport/Sse/Store/CachePoolStore.php
index 68a476fb..02e3001e 100644
--- a/src/Server/Transport/Sse/Store/CachePoolStore.php
+++ b/src/Server/Transport/Sse/Store/CachePoolStore.php
@@ -45,6 +45,11 @@ public function pop(Uuid $id): ?string
         }
 
         $messages = $item->get();
+
+        if ([] === $messages) {
+            return null;
+        }
+
         $message = array_shift($messages);
 
         $item->set($messages);