Error after update to 5.5.1

I get the following error when I try to open some page. It is appear after updating WordPress to 5.5.1.

Notice: Undefined offset: 0 in /home/radenkz/public_html/wp-includes/class-wp-block.php on line 211

Fatal error: Uncaught Error: Call to a member function render() on null in /home/radenkz/public_html/wp-includes/class-wp-block.php:211 
Stack trace: 
#0 /home/radenkz/public_html/wp-includes/blocks.php(720): WP_Block->render() 
#1 /home/radenkz/public_html/wp-includes/blocks.php(758): render_block(Array) #2 /home/radenkz/public_html/wp-includes/class-wp-hook.php(287): do_blocks('<!-- wp:paragra...') 
#3 /home/radenkz/public_html/wp-includes/plugin.php(206): WP_Hook->apply_filters('<!-- wp:paragra...', Array) 
#4 /home/radenkz/public_html/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php(1683): apply_filters('the_content', '<!-- wp:paragra...')
#5 /home/radenkz/public_html/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php(505): WP_REST_Posts_Controller->prepare_item_for_response(Object(WP_Post), Object(WP_REST_Request)) 
#6 /home/radenkz/public_html/wp-includes/rest-api/class-wp-rest-server.php(1050): WP_REST_Posts_Controller->get_item(Object(WP_REST_Request))
#7 /home/radenkz/public_html/wp-incl in /home/radenkz/public_html/wp-includes/class-wp-block.php on line 211



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