diff --git a/src/JsSse.php b/src/JsSse.php
index 8c92de6f7a..5b1b429346 100644
--- a/src/JsSse.php
+++ b/src/JsSse.php
@@ -190,7 +190,7 @@ protected function initSse(): void
         }
 
         // prevent buffering
-        if (ob_get_level()) {
+        while (ob_get_level() > 0) {
             ob_end_flush();
         }
     }