HSS型HSP特有のジェットコースター感情を整えるには

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Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in /home/nailtext/ns-project.ink/public_html/hss-hsp/wp-content/plugins/rich-table-of-content/functions.php:490 Stack trace: #0 /home/nailtext/ns-project.ink/public_html/hss-hsp/wp-includes/class-wp-hook.php(310): rtoc_switch_mokuji('<p>\xE3\x81\x93\xE3\x82\x93\xE3\x81\xAB\xE3\x81\xA1...') #1 /home/nailtext/ns-project.ink/public_html/hss-hsp/wp-includes/plugin.php(205): WP_Hook->apply_filters('<p>\xE3\x81\x93\xE3\x82\x93\xE3\x81\xAB\xE3\x81\xA1...', Array) #2 /home/nailtext/ns-project.ink/public_html/hss-hsp/wp-includes/post-template.php(256): apply_filters('the_content', '\xE3\x81\x93\xE3\x82\x93\xE3\x81\xAB\xE3\x81\xA1\xE3\x81\xAF...') #3 /home/nailtext/ns-project.ink/public_html/hss-hsp/wp-content/themes/jin/single.php(58): the_content() #4 /home/nailtext/ns-project.ink/public_html/hss-hsp/wp-includes/template-loader.php(106): include('/home/nailtext/...') #5 /home/nailtext/ns-project.ink/public_html/hss-hsp/wp-blog-header.php(19): require_once('/home/nailtext/...') #6 /home/nailtext/ns-project.ink/public_html/hss-hsp/index.php(17): require('/home/nailtext/...') #7 {main} thrown in /home/nailtext/ns-project.ink/public_html/hss-hsp/wp-content/plugins/rich-table-of-content/functions.php on line 490