Import problem

This is an amazing plugin for making online quiz. At present I am facing problem to import the quizzes. I upgraded WP to 4.4.1 but before that it was working. Please help me regarding this.

WordPress database error: [Column ‘admin_email’ cannot be null]
INSERT INTO wp_wp_pro_quiz_master (name, text, result_text, title_hidden, btn_restart_quiz_hidden, btn_view_question_hidden, question_random, answer_random, time_limit, statistics_on, statistics_ip_lock, result_grade_enabled, show_points, quiz_run_once, quiz_run_once_type, quiz_run_once_cookie, quiz_run_once_time, numbered_answer, hide_answer_message_box, disabled_answer_mark, show_max_question, show_max_question_value, show_max_question_percent, toplist_activated, toplist_data, show_average_result, prerequisite, quiz_modus, show_review_question, quiz_summary_hide, skip_question_disabled, email_notification, user_email_notification, show_category_score, hide_result_correct_question, hide_result_quiz_time, hide_result_points, autostart, forcing_question_solve, hide_question_position_overview, hide_question_numbering, form_activated, form_show_position, start_only_registered_user, questions_per_page, sort_categories, show_category, category_id, admin_email, user_email, plugin_container) VALUES (‘yes’, ‘NET’, ‘a:2:{s:4:\”text\”;a:0:{}s:7:\”prozent\”;a:0:{}}’, 0, 0, 0, 1, 1, 0, 0, 1440, 1, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, ‘a:8:{s:25:\”toplistDataAddPermissions\”;i:1;s:15:\”toplistDataSort\”;i:1;s:22:\”toplistDataAddMultiple\”;b:1;s:19:\”toplistDataAddBlock\”;i:1;s:20:\”toplistDataShowLimit\”;i:10;s:17:\”toplistDataShowIn\”;i:1;s:18:\”toplistDataCaptcha\”;b:0;s:23:\”toplistDataAddAutomatic\”;b:1;}’, 0, 0, 3, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, NULL, NULL, ‘O:31:\”WpProQuiz_Model_PluginContainer\”:2:{s:38:\”WpProQuiz_Model_PluginContainer_data\”;a:0:{}s:10:\”*_mapper\”;N;}’

https://www.ads-software.com/plugins/wp-pro-quiz/