diff --git a/core/modules/big_pipe/src/Render/BigPipe.php b/core/modules/big_pipe/src/Render/BigPipe.php
index 9bbe7d99c2..1036e9148c 100644
--- a/core/modules/big_pipe/src/Render/BigPipe.php
+++ b/core/modules/big_pipe/src/Render/BigPipe.php
@@ -330,7 +330,7 @@ protected function sendPreBody($pre_body, array $no_js_placeholders, AttachedAss
     // Extract the scripts_bottom markup: the no-JS BigPipe placeholders that we
     // will render may attach additional asset libraries, and if so, it will be
     // necessary to re-render scripts_bottom.
-    list($pre_scripts_bottom, $scripts_bottom, $post_scripts_bottom) = explode('<drupal-big-pipe-scripts-bottom-marker>', $pre_body, 3);
+    list($pre_scripts_bottom, $scripts_bottom, $post_scripts_bottom) = array_pad(explode('<drupal-big-pipe-scripts-bottom-marker>', $pre_body, 3), 3, NULL);
     $cumulative_assets_initial = clone $cumulative_assets;
 
     $this->sendNoJsPlaceholders($pre_scripts_bottom . $post_scripts_bottom, $no_js_placeholders, $cumulative_assets);