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Warning: Undefined array key "groups" in /var/www/html/wp-content/plugins/my-calendar/my-calendar-output.php on line 1971

Fatal error: Uncaught TypeError: array_merge(): Argument #2 must be of type array, null given in /var/www/html/wp-content/plugins/my-calendar/my-calendar-output.php:1971 Stack trace: #0 /var/www/html/wp-content/plugins/my-calendar/my-calendar-output.php(1971): array_merge(Array, NULL) #1 /var/www/html/wp-content/plugins/my-calendar/my-calendar-shortcodes.php(102): my_calendar(Array) #2 /var/www/html/wp-includes/shortcodes.php(434): my_calendar_insert(Array, '', 'my_calendar') #3 [internal function]: do_shortcode_tag(Array) #4 /var/www/html/wp-includes/shortcodes.php(273): preg_replace_callback('/\\[(\\[?)(my_cal...', 'do_shortcode_ta...', '\n<div class="wp...') #5 /var/www/html/wp-includes/class-wp-hook.php(324): do_shortcode('\n<div class="wp...') #6 /var/www/html/wp-includes/plugin.php(205): WP_Hook->apply_filters('\n<div class="wp...', Array) #7 /var/www/html/wp-includes/blocks/post-content.php(50): apply_filters('the_content', '<!-- wp:cover {...') #8 /var/www/html/wp-includes/class-wp-block.php(586): render_block_core_post_content(Array, '<!-- wp:cover {...', Object(WP_Block)) #9 /var/www/html/wp-includes/class-wp-block.php(566): WP_Block->render() #10 /var/www/html/wp-includes/blocks.php(2359): WP_Block->render() #11 /var/www/html/wp-includes/blocks.php(2431): render_block(Array) #12 /var/www/html/wp-includes/block-template.php(291): do_blocks('<!-- wp:templat...') #13 /var/www/html/wp-includes/template-canvas.php(12): get_the_block_template_html() #14 /var/www/html/wp-includes/template-loader.php(106): include('/var/www/html/w...') #15 /var/www/html/wp-blog-header.php(19): require_once('/var/www/html/w...') #16 /var/www/html/index.php(17): require('/var/www/html/w...') #17 {main} thrown in /var/www/html/wp-content/plugins/my-calendar/my-calendar-output.php on line 1971