PHP fpm – value is NULL for a ZEND_INI_PARSER_ENTRY

I have a server running LEMP stack that hosts a wide range websites. During the night, all the sites got shutdown and the message “502 bad gateway” 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.

NOTE: During the night, no updates or changes has been made to the system

● 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.

JavaScript
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● 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_ENTRYJul 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 failedJul 27 09:35:38 Ubuntu-2010-groovy-64-minimal systemd[1]: php7.4-fpm.service: Main process exited, code=exited, status=78/CONFIGJul 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.​

I’m grateful for any ideas that you could have!

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Update: I solved this issue by removing php7.4-fpm and installing it again. However, the problem still remains. Why did php7.4-fpm suddenly stopped working?

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