Error / conflict with elasticpress

Hello,

There is a conflict or something with elasticpress. When I index the content, the bellow error message appears:

PHP Fatal error: Uncaught Error: Call to a member function get_name() on boolean in /var/www/new.example.ro/wp-content/plugins/wp-poll/templates/single-poll/title.php:14
Stack trace:

#0 /var/www/new.example.ro/wp-content/plugins/wp-poll/includes/functions.php(453): include()
#1 /var/www/new.example.ro/wp-content/plugins/wp-poll/includes/template-hook-functions.php(17): wpp_get_template('single-poll/tit...')
#2 /var/www/new.example.ro/wp-includes/class-wp-hook.php(307): wpp_single_poll_title('')
#3 /var/www/new.example.ro/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters('', Array)
#4 /var/www/new.example.ro/wp-includes/plugin.php(474): WP_Hook->do_action(Array)
#5 /var/www/new.example.ro/wp-content/plugins/wp-poll/templates/content-single-poll.php(43): do_action('wpp_single_poll...')
#6 /var/www/new.example.ro/wp-content/plugins/wp-poll/includes/functions.php(453): include('/var/www/new.ca...')
#7 /var/www/new.example.ro/wp-content/plugins/wp-poll/includes/classes/class-shortcodes.php(102): wpp_get_template('content- in /var/www/new.example.ro/wp-content/plugins/wp-poll/templates/single-poll/title.php on line 14
Fatal error: Uncaught Error: Call to a member function get_name() on boolean in /var/www/new.example.ro/wp-content/plugins/wp-poll/templates/single-poll/title.php:14
Stack trace:
#0 /var/www/new.example.ro/wp-content/plugins/wp-poll/includes/functions.php(453): include()
#1 /var/www/new.example.ro/wp-content/plugins/wp-poll/includes/template-hook-functions.php(17): wpp_get_template('single-poll/tit...')
#2 /var/www/new.example.ro/wp-includes/class-wp-hook.php(307): wpp_single_poll_title('')
#3 /var/www/new.example.ro/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters('', Array)
#4 /var/www/new.example.ro/wp-includes/plugin.php(474): WP_Hook->do_action(Array)
#5 /var/www/new.example.ro/wp-content/plugins/wp-poll/templates/content-single-poll.php(43): do_action('wpp_single_poll...')
#6 /var/www/new.example.ro/wp-content/plugins/wp-poll/includes/functions.php(453): include('/var/www/new.ca...')
#7 /var/www/new.example.ro/wp-content/plugins/wp-poll/includes/classes/class-shortcodes.php(102): wpp_get_template('content- in /var/www/new.example.ro/wp-content/plugins/wp-poll/templates/single-poll/title.php on line 14