diff --git a/typo3/sysext/frontend/Classes/ContentObject/ContentObjectRenderer.php b/typo3/sysext/frontend/Classes/ContentObject/ContentObjectRenderer.php
index 1866b743c94fe4d9f6911093c0f7d05e1f318726..cf767932e2b6b6fe5e5a09f605761db8b051de1e 100644
--- a/typo3/sysext/frontend/Classes/ContentObject/ContentObjectRenderer.php
+++ b/typo3/sysext/frontend/Classes/ContentObject/ContentObjectRenderer.php
@@ -1187,7 +1187,7 @@ class ContentObjectRenderer implements LoggerAwareInterface
     {
         $tstamp = (int)$tstamp;
         $tsfe = $this->getTypoScriptFrontendController();
-        if ($tstamp > (int)$tsfe->register['SYS_LASTCHANGED']) {
+        if ($tstamp > (int)($tsfe->register['SYS_LASTCHANGED'] ?? 0)) {
             $tsfe->register['SYS_LASTCHANGED'] = $tstamp;
         }
     }