Intermittent error

I am getting the following error intermittently when this plugin is installed:
“wordpress Fatal error: Cannot redeclare get_plugin_data()”

…last night I was getting it consistently so I moved the “participants-database/” directory to /tmp/ and the problem went away. Then this morning I moved the directory back to “plugins/participants-database/” and the error message does not appear. This plugin is the only one that uses that function at all …that’s why I focused on this plugin.

Any advice would be appreciated. I’m including the content from my /wp-content/debug.log below also.

PHP Fatal error:  Cannot redeclare get_plugin_data() in ~H�٣^? on line 68
PHP Stack trace:
PHP   1. {main}() /var/www/html/nbk/public_html/wp-cron.php:0
PHP   2. do_action_ref_array() /var/www/html/nbk/public_html/wp-cron.php:117
PHP   3. WP_Hook->do_action() /var/www/html/nbk/public_html/wp-includes/plugin.php:515
PHP   4. WP_Hook->apply_filters() /var/www/html/nbk/public_html/wp-includes/class-wp-hook.php:323
PHP   5. call_user_func_array:{/var/www/html/nbk/public_html/wp-includes/class-wp-hook.php:298}() /var/www/html/nbk/public_html/wp-includes/class-wp-hook.php    :298
PHP   6. wp_version_check() /var/www/html/nbk/public_html/wp-includes/class-wp-hook.php:298
PHP   7. do_action() /var/www/html/nbk/public_html/wp-includes/update.php:183
PHP   8. WP_Hook->do_action() /var/www/html/nbk/public_html/wp-includes/plugin.php:453
PHP   9. WP_Hook->apply_filters() /var/www/html/nbk/public_html/wp-includes/class-wp-hook.php:323
PHP  10. call_user_func_array:{/var/www/html/nbk/public_html/wp-includes/class-wp-hook.php:298}() /var/www/html/nbk/public_html/wp-includes/class-wp-hook.php    :298
PHP  11. wp_maybe_auto_update() /var/www/html/nbk/public_html/wp-includes/class-wp-hook.php:298
PHP  12. include_once() /var/www/html/nbk/public_html/wp-includes/update.php:530
PHP Fatal error:  Cannot redeclare get_plugin_data() in ~H�ݣ^? on line 68