redis php error

My site crashed today (maria db killed by oom) and the first PHP error message a few minutes before it crashed was about redis.

Any advice on finding the cause of this error would be much appreciated.

[10-Nov-2022 20:48:10 UTC] Predis\Connection\ConnectionException: Error while reading line from the server. [tcp://127.0.0.1:6379] in /var/www/html/wordpress/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Connection/AbstractCo>
Stack trace:
#0 /var/www/html/wordpress/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Connection/StreamConnection.php(286): Predis\Connection\AbstractConnection->onConnectionError()
#1 /var/www/html/wordpress/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Connection/AbstractConnection.php(120): Predis\Connection\StreamConnection->read()
#2 /var/www/html/wordpress/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Connection/AbstractConnection.php(112): Predis\Connection\AbstractConnection->readResponse()
#3 /var/www/html/wordpress/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Client.php(316): Predis\Connection\AbstractConnection->executeCommand()
#4 /var/www/html/wordpress/wp-content/plugins/redis-cache/dependencies/predis/predis/src/Client.php(299): Predis\Client->executeCommand()
#5 /var/www/html/wordpress/wp-content/object-cache.php(1792): Predis\Client->__call()
#6 /var/www/html/wordpress/wp-content/object-cache.php(182): WP_Object_Cache->get()
#7 /var/www/html/wordpress/wp-includes/option.php(305): wp_cache_get()
#8 /var/www/html/wordpress/wp-includes/option.php(191): wp_load_alloptions()
#9 /var/www/html/wordpress/wp-includes/default-constants.php(161): get_option()
#10 /var/www/html/wordpress/wp-settings.php(365): wp_plugin_directory_constants()
#11 /var/www/html/wordpress/wp-config.php(111): require_once('/var/www/html/w...')
#12 /var/www/html/wordpress/wp-load.php(50): require_once('/var/www/html/w...')
#13 /var/www/html/wordpress/wp-blog-header.php(13): require_once('/var/www/html/w...')
#14 /var/www/html/wordpress/index.php(17): require('/var/www/html/w...')
#15 {main}

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