jokimazi

$post = get_post();
    	$added_styles = array();
    	$added_scripts = array();
		if ( has_blocks( isset($post->post_content) ) ) {
		    $blocks = parse_blocks( $post->post_content );

		    self::traverse_block_styles( $blocks, $added_styles, $added_scripts );
		}

Just added isset() on line 104, fixes the error.

$post = get_post();
    	$added_styles = array();
    	$added_scripts = array();
		if ( has_blocks( $post->post_content ) ) {
		    $blocks = parse_blocks( $post->post_content );

		    self::traverse_block_styles( $blocks, $added_styles, $added_scripts );
		}