Updating plugin broke my site

I got the following message on my site:
Unable to get results
Tried accessing nonexisting field (comments_count) on node type (Media)

I read other topics and updated the plugin (3.5.0 to 4.0.9).
Then, a fatal error happened and I got a mail.

The mail says:

エラータイプ E_ERROR が (pathname)/wp-content/plugins/insta-gallery/lib/gutenberg/class-load.php ファイルの 104 行目で発生しました。 エラーメッセージ: Uncaught Error: Call to undefined function QuadLayers\IGG\Gutenberg\array_key_first() in (pathname)/wp-content/plugins/insta-gallery/lib/gutenberg/class-load.php:104
Stack trace:
#0 (pathname)/wp-content/plugins/insta-gallery/lib/gutenberg/class-load.php(72): QuadLayers\IGG\Gutenberg\Load->get_attributes()
#1 (pathname)/wp-includes/class-wp-hook.php(287): QuadLayers\IGG\Gutenberg\Load->register_block(”)
#2 (pathname)/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array)
#3 (pathname)/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#4 (pathname)/wp-settings.php(540): do_action(‘init’)
#5 (pathname)/wp-config.php(103): require_once(‘/var/www/vhosts…’)
#6 (pathname)/wp-load.php(37): require_once(‘/var/www/vhosts…’)
#7 /var/

It seems to be about Gutenberg editor, and I use “Disable Gutenberg” plugin.
So I deactivated the plugin and try to update again, but the same error happened.

Is there any idea to solve this?

My environment is:
WordPress 5.4.13
PHP 7.1.33

• This topic was modified 1 year, 8 months ago by wakabayashi0827.