PHP errors, post type page shows critical error

Dear,
It seems there’s something messed up in the code of the plugin.
The question post type page only shows the last entry with a critical error next to it.
Following PHP errors are thrown (a lot):
[Sat Jan 07 17:55:51.397890 2023] [error] [pid 110234] mod_proxy_fcgi.c(887): [client 94.110.53.141:0] AH01071: Got error ‘uestion.php on line 409PHP message: PHP Fatal error: Uncaught TypeError: ltrim(): Argument #1 ($string) must be of type string, WP_Error given in /data/sites/web/xxx/www/wp-includes/formatting.php:4379\nStack trace:\n#0 /data/sites/web/xxx/www/wp-includes/formatting.php(4379): ltrim()\n#1 /data/sites/web/xxx/www/wp-content/plugins/dw-question-answer-pro/inc/Posts/Question.php(415): esc_url()\n#2 /data/sites/web/xxx/www/wp-includes/class-wp-hook.php(308): DWQA_Posts_Question->columns_content()\n#3 /data/sites/web/xxx/www/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters()\n#4 /data/sites/web/xxx/www/wp-includes/plugin.php(517): WP_Hook->do_action()\n#5 /data/sites/web/xxx/www/wp-admin/includes/class-wp-posts-list-table.php(1363): do_action()\n#6 /data/sites/web/xxx/www/wp-admin/includes/class-wp-list-table.php(1532): WP_Posts_List_Table->column_default()\n#7 /data/sites/web/xxx/www/wp-admin/includes/class-wp-posts-list-ta…’
[Sat Jan 07 17:55:57.383423 2023] [error] [pid 110234] mod_proxy_fcgi.c(887): [client 94.110.53.141:0] AH01071: Got error ‘PHP message: PHP Warning: Undefined variable $term in /data/sites/web/xxx/www/wp-content/plugins/dw-question-answer-pro/inc/Posts/Question.php on line 409PHP message: PHP Fatal error: Uncaught TypeError: ltrim(): Argument #1 ($string) must be of type string, WP_Error given in /data/sites/web/xxx/www/wp-includes/formatting.php:4379\nStack trace:\n#0 /data/sites/web/xxx/www/wp-includes/formatting.php(4379): ltrim()\n#1 /data/sites/web/xxx/www/wp-content/plugins/dw-question-answer-pro/inc/Posts/Question.php(415): esc_url()\n#2 /data/sites/web/xxx/www/wp-includes/class-wp-hook.php(308): DWQA_Posts_Question->columns_content()\n#3 /data/sites/web/xxx/www/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters()\n#4 /data/sites/web/xxx/www/wp-includes/plugin.php(517): WP_Hook->do_action()\n#5 /data/sites/web/xxx/www/wp-admin/includes/class-wp-posts-list-table.php(1363): do_action()\n#6 /data/sites/web/xxx/www/wp-admin/includes/class-wp-list-table.php(1532): WP_Posts_List_Table->column_default()\n#7 /data/sites/web/xxx/www/wp-admin/includes/class-wp-posts-list-ta…’