From c66f74dc0d5b1286ad5f8c31138d13b2589a23ad Mon Sep 17 00:00:00 2001
From: edalzell <erin@silentz.co>
Date: Fri, 11 Aug 2023 13:10:19 -0700
Subject: [PATCH] check buffer first

---
 src/Sse/ServerSentEvent.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Sse/ServerSentEvent.php b/src/Sse/ServerSentEvent.php
index 7806b77..944b45d 100644
--- a/src/Sse/ServerSentEvent.php
+++ b/src/Sse/ServerSentEvent.php
@@ -60,7 +60,9 @@ public function __toString(): string
     public function __invoke()
     {
         echo $this;
-        ob_flush();
+        if (ob_get_contents()) {
+            ob_flush();
+        }
         flush();
     }