fatal error with WP activity log plugin

hello
When using wp activity log plugin https://he.wordpress.org/plugins/wp-security-audit-log/
with decalog active along with it (wp activity only tracks the users activity on the website), there’s a fatal php error when reaching the checkout page of woocommerce, on the front end.
the user gets a server error in this case, and the logs in new relic (from the new relic agent installed on the server) give this errors:
https://snipboard.io/yAiZKP.jpg

in Decalog\Listener\WsalListener::wsal_logged_alert called at /home/xxxxxx/domains/xxxxx.co.il/public_html/wp-includes/class-wp-hook.php (303)
 in WP_Hook::apply_filters called at /home/xxxxx/domains/xxxx.co.il/public_html/wp-includes/class-wp-hook.php (327)
 in WP_Hook::do_action called at /home/xxxxx/domains/xxxxxx/public_html/wp-includes/plugin.php (470)
 in do_action called at /home/xxxxx/domains/xxxxx/public_html/wp-content/plugins/wp-security-audit-log-premium/classes/Loggers/Database.php (103)
 in WSAL_Loggers_Database::Log called at /home/xxxxx/domains/xxxxxx/public_html/wp-content/plugins/wp-security-audit-log-premium/classes/AlertManager.php (694)
 in WSAL_AlertManager::Log called at /home/xxxxx/domains/xxxxxx/public_html/wp-content/plugins/wp-security-audit-log-premium/classes/AlertManager.php (359)
 in WSAL_AlertManager::_CommitItem called at /home/xxxx/domains/xxxxx/public_html/wp-content/plugins/wp-security-audit-log-premium/classes/AlertManager.php (248)
 in WSAL_AlertManager::Trigger called at /home/xxxxx/domains/xxxxx/public_html/wp-content/plugins/wp-security-audit-log-premium/classes/Sensors/Content.php (477)
 in WSAL_Sensors_Content::viewing_post called at /home/xxxxxx/domains/xxxxxx/public_html/wp-includes/class-wp-hook.php (303)
 in WP_Hook::apply_filters called at /home/xxxxxx/domains/xxxxxx/public_html/wp-includes/class-wp-hook.php (327)
 in WP_Hook::do_action called at /home/xxxxxx/domains/xxxxxx/public_html/wp-includes/plugin.php (470)
 in do_action called at /home/xxxxxx/domains/xxxxxx/public_html/wp-includes/general-template.php (3015)
 in wp_head called at /home/xxxxxx/domains/xxxxxx/public_html/wp-content/themes/flatsome/header.php (10)
 in require_once called at /home/xxxxxx/domains/xxxxxx/public_html/wp-includes/template.php (770)
 in load_template called at /home/xxxxxx/domains/xxxxxx/public_html/wp-includes/template.php (716)
 in locate_template called at /home/xxxxxx/domains/xxxxxx/public_html/wp-includes/general-template.php (48)
 in get_header called at /home/xxxxxx/domains/xxxxxx/public_html/wp-content/themes/flatsome/single.php (8)
 in include called at /home/xxxxxx/domains/xxxxxx/public_html/wp-includes/template-loader.php (106)
 in require_once called at /home/xxxxxx/domains/xxxxxx/public_html/wp-blog-header.php (19)
 in require called at /home/xxxxxx/domains/xxxxxx/public_html/index.php (17)

—

in Decalog\Listener\WsalListener::wsal_logged_alert called at /home/xxxxxx/domains/xxxxxx/public_html/wp-includes/class-wp-hook.php (303)
 in WP_Hook::apply_filters called at /home/xxxxxx/domains/xxxxxx/public_html/wp-includes/class-wp-hook.php (327)
 in WP_Hook::do_action called at /home/xxxxxx/domains/xxxxxx/public_html/wp-includes/plugin.php (470)
 in do_action called at /home/xxxxxx/domains/xxxxxx/public_html/wp-content/plugins/wp-security-audit-log-premium/classes/Loggers/Database.php (103)
 in WSAL_Loggers_Database::Log called at /home/xxxxxx/domains/xxxxxx/public_html/wp-content/plugins/wp-security-audit-log-premium/classes/AlertManager.php (694)
 in WSAL_AlertManager::Log called at /home/xxxxxx/domains/xxxxxx/public_html/wp-content/plugins/wp-security-audit-log-premium/classes/AlertManager.php (359)
 in WSAL_AlertManager::_CommitItem called at /home/xxxxxx/domains/xxxxxx/public_html/wp-content/plugins/wp-security-audit-log-premium/classes/AlertManager.php (248)
 in WSAL_AlertManager::Trigger called at /home/xxxxxx/domains/xxxxxx/public_html/wp-content/plugins/wp-security-audit-log-premium/classes/Sensors/Content.php (477)
 in WSAL_Sensors_Content::viewing_post called at /home/xxxxxx/domains/xxxxxx/public_html/wp-includes/class-wp-hook.php (303)
 in WP_Hook::apply_filters called at /home/xxxxxx/domains/xxxxxx/public_html/wp-includes/class-wp-hook.php (327)
 in WP_Hook::do_action called at /home/xxxxxx/domains/xxxxxx/public_html/wp-includes/plugin.php (470)
 in do_action called at /home/xxxxxx/domains/xxxxxx/public_html/wp-includes/general-template.php (3015)
 in wp_head called at /home/xxxxxx/domains/xxxxxx/public_html/wp-content/themes/flatsome/header.php (10)
 in require_once called at /home/xxxxxx/domains/xxxxxx/public_html/wp-includes/template.php (770)
 in load_template called at /home/xxxxxx/domains/xxxxxx/public_html/wp-includes/template.php (716)
 in locate_template called at /home/xxxxxx/domains/xxxxxx/public_html/wp-includes/general-template.php (48)
 in get_header called at /home/xxxxxx/domains/xxxxxx/public_html/wp-content/themes/flatsome/page-blank.php (5)
 in require called at /home/xxxxxx/domains/xxxxxx/public_html/wp-includes/template.php (772)
 in load_template called at /home/xxxxxx/domains/xxxxxx/public_html/wp-includes/template.php (716)
 in locate_template called at /home/xxxxxx/domains/xxxxxx/public_html/wp-includes/general-template.php (204)
 in get_template_part called at /home/xxxxxx/domains/xxxxxx/public_html/wp-content/themes/flatsome/page.php (12)
 in include called at /home/xxxxxx/domains/xxxxxx/public_html/wp-includes/template-loader.php (106)
 in require_once called at /home/xxxxxx/domains/xxxxxx/public_html/wp-blog-header.php (19)
 in require called at /home/xxxxxx/domains/xxxxxx/public_html/index.php (17)