title: PHP fpm - value is NULL for a ZEND_INI_PARSER_ENTRY
body: <p>I have a server running LEMP stack that hosts a wide range websites. During the night, all the sites got shutdown and the message &quot;502 bad gateway&quot; Is displayed. I followed the stream of errors and concluded that php7.4-fpm was the issue. I need help to figure out how to solve the error below.</p>
  <p>NOTE: <em>During the night, no updates or changes has been made to the system</em></p>
  <pre><code>● php7.4-fpm.service - The PHP 7.4 FastCGI Process Manager
       Loaded: loaded (/lib/systemd/system/php7.4-fpm.service; enabled; vendor preset: enabled)
       Active: failed (Result: exit-code) since Tue 2021-07-27 09:35:38 CEST; 7s ago
         Docs: man:php-fpm7.4(8)
      Process: 1561620 ExecStart=/usr/sbin/php-fpm7.4 --nodaemonize --fpm-config /etc/php/7.4/fpm/php-fpm.conf (code=exited, status=78)
      Process: 1561621 ExecStopPost=/usr/lib/php/php-fpm-socket-helper remove /run/php/php-fpm.sock /etc/php/7.4/fpm/pool.d/www.conf 74 (code=exited, status=0/SUCCESS)
     Main PID: 1561620 (code=exited, status=78)
  
  Jul 27 09:35:38 Ubuntu-2010-groovy-64-minimal systemd[1]: Starting The PHP 7.4 FastCGI Process Manager...
  Jul 27 09:35:38 Ubuntu-2010-groovy-64-minimal php-fpm7.4[1561620]: [27-Jul-2021 09:35:38] ERROR: [/etc/php/7.4/fpm/php-fpm.conf:98] value is NULL for a ZEND_INI_PARSER_ENTRY
  Jul 27 09:35:38 Ubuntu-2010-groovy-64-minimal php-fpm7.4[1561620]: [27-Jul-2021 09:35:38] ERROR: failed to load configuration file '/etc/php/7.4/fpm/php-fpm.conf'
  Jul 27 09:35:38 Ubuntu-2010-groovy-64-minimal php-fpm7.4[1561620]: [27-Jul-2021 09:35:38] ERROR: FPM initialization failed
  Jul 27 09:35:38 Ubuntu-2010-groovy-64-minimal systemd[1]: php7.4-fpm.service: Main process exited, code=exited, status=78/CONFIG
  Jul 27 09:35:38 Ubuntu-2010-groovy-64-minimal systemd[1]: php7.4-fpm.service: Failed with result 'exit-code'.
  Jul 27 09:35:38 Ubuntu-2010-groovy-64-minimal systemd[1]: Failed to start The PHP 7.4 FastCGI Process Manager.
  </code></pre>
  <p>I'm grateful for any ideas that you could have!</p>