Array to string conversion error

Logged during the update to version 1.9.0.

01-Mar-2019 19:15:30 UTC] PHP Notice:  Array to string conversion in C:\wamp\www\eltownhall.com\wp-content\plugins\participants-database\classes\PDb_Update_Notices.class.php on line 380

[01-Mar-2019 19:15:30 UTC] PHP Stack trace:

[01-Mar-2019 19:15:30 UTC] PHP   1. {main}() C:\wamp\www\xxx.com\wp-admin\plugin-install.php:0

[01-Mar-2019 19:15:30 UTC] PHP   2. do_action() C:\wamp\www\xxx.com\wp-admin\plugin-install.php:70

[01-Mar-2019 19:15:30 UTC] PHP   3. WP_Hook->do_action() C:\wamp\www\xxx.com\wp-includes\plugin.php:465

[01-Mar-2019 19:15:30 UTC] PHP   4. WP_Hook->apply_filters() C:\wamp\www\xxx.com\wp-includes\class-wp-hook.php:310

[01-Mar-2019 19:15:30 UTC] PHP   5. PDb_Update_Notices->install_plugin_information() C:\wamp\www\xxx.com\wp-includes\class-wp-hook.php:286