Getting blank screen on node export

When I click on node export, I am getting blank screen for some nodes.
In Error logs, I can see this error.
PHP Fatal error: ob_get_clean(): Cannot use output buffering in output buffering display handlers in /mnt/www/html/example/vendor/twig/twig/src/Template.php on line 368 request_id="v-9eea0512-51b7-11f0-a12e-dff14ae11cfa"