Error when adding/editing Seasons | WordPress.org

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When adding or editing a season I get the following error

Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in /home4/awethuor/public_html/website_8910ed38/wp-content/plugins/joomsport-achievements/includes/meta-boxes/joomsport-achievments-meta-season.php:309 Stack trace: #0 /home4/awethuor/public_html/website_8910ed38/wp-content/plugins/joomsport-achievements/includes/meta-boxes/joomsport-achievments-meta-season.php(259): JoomSportAchievmentsMetaSeason::saveMetaPoints(1050) #1 /home4/awethuor/public_html/website_8910ed38/wp-includes/class-wp-hook.php(326): JoomSportAchievmentsMetaSeason::joomsport_season_save_metabox(1050, Object(WP_Post)) #2 /home4/awethuor/public_html/website_8910ed38/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #3 /home4/awethuor/public_html/website_8910ed38/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #4 /home4/awethuor/public_html/website_8910ed38/wp-includes/post.php(4891): do_action('save_post', 1050, Object(WP_Post), true) #5 /home4/awethuor/public_html/website_8910ed38/wp-includes/post.php(4993): wp_insert_post(Array, false, true) #6 /home4/awethuor/public_html/website_8910ed38/wp-admin/includes/post.php(453): wp_update_post(Array) #7 /home4/awethuor/public_html/website_8910ed38/wp-admin/post.php(227): edit_post() #8 main thrown in /home4/awethuor/public_html/website_8910ed38/wp-content/plugins/joomsport-achievements/includes/meta-boxes/joomsport-achievments-meta-season.php on line 309

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