( $stats['sizes'][ $size_k ] ) && ! empty( $savings ) ) {
				$stats['sizes'][ $size_k ]->bytes       = $stats['sizes'][ $size_k ]->bytes + $savings['bytes'];
				$stats['sizes'][ $size_k ]->size_before = $stats['sizes'][ $size_k ]->size_before > $savings['size_before'] ? $stats['sizes'][ $size_k ]->size_before : $savings['size_before'];
				$stats['sizes'][ $size_k ]->percent     = ! empty( $stats['sizes'][ $size_k ]->bytes ) && $stats['sizes'][ $size_k ]->size_before > 0 ? ( $stats['sizes'][ $size_k ]->bytes / $stats['sizes'][ $size_k ]->size_before ) * 100 : $stats['sizes'][ $size_k ]->percent;
				$stats['sizes'][ $size_k ]->percent     = round( $stats['sizes'][ $size_k ]->percent, 1 );
			}
		}

		return $this->total_compression( $stats );
	}

	/**
	 * Iterate over all the size stats and calculate the total stats
	 *
	 * @param array $stats  Stats array.
	 *
	 * @return mixed
	 */
	public function total_compression( $stats ) {
		$stats['stats']['size_before'] = 0;
		$stats['stats']['size_after']  = 0;
		$stats['stats']['time']        = 0;

		foreach ( $stats['sizes'] as $size_stats ) {
			$stats['stats']['size_before'] += ! empty( $size_stats->size_before ) ? $size_stats->size_before : 0;
			$stats['stats']['size_after']  += ! empty( $size_stats->size_after ) ? $size_stats->size_after : 0;
			$stats['stats']['time']        += ! empty( $size_stats->time ) ? $size_stats->time : 0;
		}

		$stats['stats']['bytes'] = ! empty( $stats['stats']['size_before'] ) && $stats['stats']['size_before'] > $stats['stats']['size_after'] ? $stats['stats']['size_before'] - $stats['stats']['size_after'] : 0;

		if ( ! empty( $stats['stats']['bytes'] ) && ! empty( $stats['stats']['size_before'] ) ) {
			$stats['stats']['percent'] = ( $stats['stats']['bytes'] / $stats['stats']['size_before'] ) * 100;
		}

		return $stats;
	}

	/**
	 * Get all the attachment meta, sum up the stats and return
	 *
	 * @param bool $force_update     Whether to forcefully update the cache.
	 *
	 * @return array|bool|mixed
	 */
	private function global_stats( $force_update = false ) {
		$stats = get_option( 'smush_global_stats' );

		// Remove id from global stats stored in db.
		if ( ! $force_update && ! empty( $stats ) && isset( $stats['size_before'] ) ) {
			if ( isset( $stats['id'] ) ) {
				unset( $stats['id'] );
			}

			return $stats;
		}

		global $wpdb;

		$smush_data = array(
			'size_before'  => 0,
			'size_after'   => 0,
			'percent'      => 0,
			'human'        => 0,
			'bytes'        => 0,
			'total_images' => 0,
		);

		$offset       = 0;
		$supersmushed = 0;
		$query_next   = true;

		while ( $query_next ) {
			$global_data = $wpdb->get_results(
				$wpdb->prepare(
					"SELECT post_id, meta_value FROM $wpdb->postmeta WHERE meta_key=%s GROUP BY post_id LIMIT %d, %d",
					Modules\Smush::$smushed_meta_key,
					$offset,
					$this->query_limit
				)
			); // Db call ok; no-cache ok.

			// If we didn't got any results.
			if ( ! $global_data ) {
				break;
			}

			foreach ( $global_data as $data ) {
				// Skip attachment, if not in attachment list.
				if ( ! in_array( $data->post_id, $this->attachments, true ) ) {
					continue;
				}

				$smush_data['id'][] = $data->post_id;
				if ( ! empty( $data->meta_value ) ) {
					$meta = maybe_unserialize( $data->meta_value );
					if ( ! empty( $meta['stats'] ) ) {

						// Check for lossy compression.
						if ( true === $meta['stats']['lossy'] ) {
							$supersmushed++;
						}

						// If the image was optimised.
						if ( ! empty( $meta['stats'] ) && $meta['stats']['size_before'] >= $meta['stats']['size_after'] ) {
							// Total Image Smushed.
							$smush_data['total_images'] += ! empty( $meta['sizes'] ) ? count( $meta['sizes'] ) : 0;
							$smush_data['size_before']  += ! empty( $meta['stats']['size_before'] ) ? (int) $meta['stats']['size_before'] : 0;
							$smush_data['size_after']   += ! empty( $meta['stats']['size_after'] ) ? (int) $meta['stats']['size_after'] : 0;
						}
					}
				}
			}

			$smush_data['bytes'] = $smush_data['size_before'] - $smush_data['size_after'];

			// Update the offset.
			$offset += $this->query_limit;

			// Compare the Offset value to total images.
			if ( ! empty( $this->total_count ) && $this->total_count <= $offset ) {
				$query_next = false;
			}
		}

		// Add directory smush image bytes.
		if ( ! empty( $this->dir_stats['bytes'] ) && $this->dir_stats['bytes'] > 0 ) {
			$smush_data['bytes'] += $this->dir_stats['bytes'];
		}
		// Add directory smush image total size.
		if ( ! empty( $this->dir_stats['orig_size'] ) && $this->dir_stats['orig_size'] > 0 ) {
			$smush_data['size_before'] += $this->dir_stats['orig_size'];
		}
		// Add directory smush saved size.
		if ( ! empty( $this->dir_stats['image_size'] ) && $this->dir_stats['image_size'] > 0 ) {
			$smush_data['size_after'] += $this->dir_stats['image_size'];
		}
		// Add directory smushed images.
		if ( ! empty( $this->dir_stats['optimised'] ) && $this->dir_stats['optimised'] > 0 ) {
			$smush_data['total_images'] += $this->dir_stats['optimised'];
		}

		// Resize Savings.
		$smush_data['resize_count']   = $this->get_savings( 'resize', false, false, true );
		$resize_savings               = $this->get_savings( 'resize', false );
		$smush_data['resize_savings'] = ! empty( $resize_savings['bytes'] ) ? $resize_savings['bytes'] : 0;

		// Conversion Savings.
		$conversion_savings               = $this->get_savings( 'pngjpg', false );
		$smush_data['conversion_savings'] = ! empty( $conversion_savings['bytes'] ) ? $conversion_savings['bytes'] : 0;

		if ( ! isset( $smush_data['bytes'] ) || $smush_data['bytes'] < 0 ) {
			$smush_data['bytes'] = 0;
		}

		// Add the resize savings to bytes.
		$smush_data['bytes']       += $smush_data['resize_savings'];
		$smush_data['size_before'] += $resize_savings['size_before'];
		$smush_data['size_after']  += $resize_savings['size_after'];

		// Add Conversion Savings.
		$smush_data['bytes']       += $smush_data['conversion_savings'];
		$smush_data['size_before'] += $conversion_savings['size_before'];
		$smush_data['size_after']  += $conversion_savings['size_after'];

		if ( $smush_data['size_before'] > 0 ) {
			$smush_data['percent'] = ( $smush_data['bytes'] / $smush_data['size_before'] ) * 100;
		}

		// Round off percentage.
		$smush_data['percent'] = round( $smush_data['percent'], 1 );

		// Human-readable format.
		$smush_data['human'] = size_format(
			$smush_data['bytes'],
			( $smush_data['bytes'] >= 1024 ) ? 1 : 0
		);

		// Setup Smushed attachment IDs.
		$this->smushed_attachments = ! empty( $smush_data['id'] ) ? $smush_data['id'] : '';

		// Super Smushed attachment count.
		$this->super_smushed = $supersmushed;

		// Remove ids from stats.
		unset( $smush_data['id'] );

		// Update cache.
		update_option( 'smush_global_stats', $smush_data, false );

		return $smush_data;
	}

	/**
	 * Returns remaining count
	 *
	 * @return int
	 */
	public function remaining_count() {
		$resmush_count   = count( $this->resmush_ids );
		$unsmushed_count = $this->total_count - $this->smushed_count - $this->skipped_count;

		// Just a failsafe - can't have remaining value be a negative value.
		$unsmushed_count = $unsmushed_count > 0 ? $unsmushed_count : 0;

		return $resmush_count + $unsmushed_count;
	}

	/**
	 * Return the number of skipped attachments.
	 *
	 * @since 3.0
	 *
	 * @param bool $force  Force data refresh.
	 *
	 * @return array
	 */
	private function skipped_count( $force ) {
		$images = wp_cache_get( 'skipped_images', 'wp-smush' );
		if ( ! $force && $images ) {
			return $images;
		}

		global $wpdb;
		$ignored_query = "SELECT DISTINCT post_id FROM $wpdb->postmeta WHERE meta_key = %s";
		$args[]        = Error_Handler::IGNORE_KEY;

		// Animated files are considered ignored
		$ignored_query .= ' OR meta_key = %s AND meta_value = %s';
		$args[]        = Error_Handler::ERROR_KEY;
		$args[]        = Error_Handler::ANIMATED_ERROR_CODE;

		// phpcs:ignore WordPress.DB.DirectDatabaseQuery, WordPress.DB.PreparedSQL.NotPrepared
		$images = $wpdb->get_col( $wpdb->prepare( $ignored_query, $args ) );
		wp_cache_set( 'skipped_images', $images, 'wp-smush' );

		return $images;
	}

	/**
	 * Checks every place where ignored or animated flag has been stored in the past to get a count.
	 *
	 * TODO: this is meant to be a temporary method to be used until the new stats are adopted. Remove in a few versions.
	 *
	 * @return int
	 */
	private function get_skipped_count() {
		global $wpdb;

		$animated_key = Media_Item::ANIMATED_META_KEY;
		$ignored_key  = Media_Item::IGNORED_META_KEY;

		$error_meta_key       = Error_Handler::ERROR_KEY;
		$animated_error_value = 'animated';

		$mime_types = ( new Smush_File() )->get_supported_mime_types();
		$mime_types = implode( "','", $mime_types );

		$query = $wpdb->prepare(
			"SELECT COUNT(DISTINCT postmeta.post_id) FROM $wpdb->postmeta as postmeta
                    INNER JOIN $wpdb->posts as posts
                        ON postmeta.post_id = posts.ID AND posts.post_type = 'attachment'
                        AND posts.post_mime_type IN ('". $mime_types ."')
					WHERE meta_key = %s
					OR meta_key = %s
					OR (meta_key = %s AND meta_value = %s)",
			$ignored_key,
			$animated_key,
			$error_meta_key,
			$animated_error_value
		);

		return (int) $wpdb->get_var( $query );
	}

	/**
	 * On sites where the new scan has never been run, this method is meant act as a fallback.
	 *
	 * TODO: this is meant to be a temporary method to be used until the new stats are adopted. Remove in a few versions.
	 *
	 * @return array
	 */
	public function get_backup_global_stats() {
		$backup_stats = wp_cache_get( 'backup_global_stats', 'wp-smush' );
		if ( empty( $backup_stats ) ) {
			$backup_stats = $this->fetch_backup_global_stats();
			wp_cache_set( 'backup_global_stats', $backup_stats, 'wp-smush' );
		}

		return $backup_stats;
	}

	public function fetch_backup_global_stats() {
		$stats                         = get_option( 'smush_global_stats' );
		$array_utils                   = new Array_Utils();
		$savings_percent               = $array_utils->get_array_value( $stats, 'percent' );
		$query                         = new Media_Item_Query();
		$image_attachment_count        = $query->get_image_attachment_count();
		$smushed_count                 = $query->get_smushed_count();
		$skipped_count                 = $this->get_skipped_count();
		$total_optimizable_items_count = $image_attachment_count - $skipped_count;
		$total_optimizable_items_count = $total_optimizable_items_count > 0 ? $total_optimizable_items_count : 0;
		$unsmushed_count               = $image_attachment_count - $smushed_count - $skipped_count;
		$unsmushed_count               = $unsmushed_count > 0 ? $unsmushed_count : 0;
		$resmush_count                 = count( (array) get_option( 'wp-smush-resmush-list', array() ) );
		$remaining_count               = $unsmushed_count + $resmush_count;
		$bytes                         = (int) $array_utils->get_array_value( $stats, 'bytes' );
		$human_bytes                   = size_format(
			$bytes,
			$bytes >= 1024 ? 1 : 0
		);
		$resize_savings                = (int) $array_utils->get_array_value( $stats, 'resize_savings' );
		$resize_savings_human          = size_format(
			$resize_savings,
			$resize_savings >= 1024 ? 1 : 0
		);
		$conversion_savings            = (int) $array_utils->get_array_value( $stats, 'conversion_savings' );
		$conversion_savings_human      = size_format(
			$conversion_savings,
			$conversion_savings >= 1024 ? 1 : 0
		);

		list( $percent_optimized, $percent_metric, $grade ) = $this->get_grade_data( $remaining_count, $image_attachment_count, $skipped_count );

		return array(
			'stats_updated_timestamp' => false,
			'is_outdated'             => true,
			'count_supersmushed'      => $query->get_lossy_count(),
			'count_smushed'           => $smushed_count,
			'count_total'             => $total_optimizable_items_count,
			'count_images'            => (int) $array_utils->get_array_value( $stats, 'total_images' ),
			'count_resize'            => (int) $array_utils->get_array_value( $stats, 'resize_count' ),
			'count_skipped'           => $skipped_count,
			'unsmushed'               => array(),
			'count_unsmushed'         => $unsmushed_count,
			'resmush'                 => array(),
			'count_resmush'           => $resmush_count,
			'size_before'             => (int) $array_utils->get_array_value( $stats, 'size_before' ),
			'size_after'              => (int) $array_utils->get_array_value( $stats, 'size_after' ),
			'savings_bytes'           => $bytes,
			'human_bytes'             => $human_bytes,
			'savings_resize'          => $resize_savings,
			'savings_resize_human'    => $resize_savings_human,
			'savings_conversion'      => $conversion_savings,
			'savings_conversion_human'=> $conversion_savings_human,
			'savings_dir_smush'       => $this->dir_stats,
			'savings_percent'         => $savings_percent > 0 ? number_format_i18n( $savings_percent, 1 ) : 0,
			'percent_grade'           => $grade,
			'percent_metric'          => $percent_metric,
			'percent_optimized'       => $percent_optimized,
			'remaining_count'         => $remaining_count,
		);
	}

	/**
	 * Returns an array that can be consumed by the JS
	 *
	 * TODO: When we have rewritten the frontend of the plugin we can directly use {@see Global_Stats::to_array()} instead
	 * 
	 * @return array
	 */
	public function get_global_stats() {
		$global_stats = Global_Stats::get();
		if ( empty( $global_stats->get_stats_update_started_timestamp() ) ) {
			// A scan was never started, use the old stats
			return $this->get_backup_global_stats();
		}

		$total_stats = $global_stats->get_sum_of_optimization_global_stats();
		/**
		 * @var $smush_stats Smush_Optimization_Global_Stats
		 */
		$smush_stats   = $global_stats->get_persistable_stats_for_optimization( Smush_Optimization::KEY )
		                              ->get_stats();
		$resize_stats  = $global_stats->get_persistable_stats_for_optimization( Resize_Optimization::KEY )
		                              ->get_stats();
		$png2jpg_stats = $global_stats->get_persistable_stats_for_optimization( Png2Jpg_Optimization::KEY )
		                              ->get_stats();

		return array(
			'stats_updated_timestamp'  => $global_stats->get_stats_updated_timestamp(),
			'is_outdated'              => $global_stats->is_outdated(),
			'count_supersmushed'       => $smush_stats->get_lossy_count(),
			'count_smushed'            => $smush_stats->get_count(),
			'count_total'              => $global_stats->get_total_optimizable_items_count(),
			'count_images'             => $global_stats->get_optimized_images_count(),
			'count_resize'             => $resize_stats->get_count(),
			'count_skipped'            => $global_stats->get_skipped_count(),
			'unsmushed'                => $global_stats->get_optimize_list()->get_ids(),
			'count_unsmushed'          => $global_stats->get_optimize_list()->get_count(),
			'resmush'                  => $global_stats->get_redo_ids(),
			'count_resmush'            => $global_stats->get_redo_count(),
			'size_before'              => $total_stats->get_size_before(),
			'size_after'               => $total_stats->get_size_after(),
			'savings_bytes'            => $total_stats->get_bytes(),
			'human_bytes'              => $total_stats->get_human_bytes(),
			'savings_resize'           => $resize_stats->get_bytes(),
			'savings_resize_human'     => $resize_stats->get_human_bytes(),
			'savings_conversion'       => $png2jpg_stats->get_bytes(),
			'savings_conversion_human' => $png2jpg_stats->get_human_bytes(),
			'savings_dir_smush'        => $this->dir_stats,
			'savings_percent'          => $total_stats->get_percent() > 0 ? number_format_i18n( $total_stats->get_percent(), 1 ) : 0,
			'percent_grade'            => $global_stats->get_grade_class(),
			'percent_metric'           => $global_stats->get_percent_metric(),
			'percent_optimized'        => $global_stats->get_percent_optimized(),
			'remaining_count'          => $global_stats->get_remaining_count(),
		);
	}

	/**
	 * @return int
	 */
	public function get_query_limit() {
		return $this->query_limit;
	}

	/**
	 * @param int $query_limit
	 */
	public function set_query_limit( $query_limit ) {
		$this->query_limit = $query_limit;

		return $this;
	}

	/**
	 * @return int
	 */
	public function get_max_rows() {
		return $this->max_rows;
	}

	/**
	 * @param int $max_rows
	 */
	public function set_max_rows( $max_rows ) {
		$this->max_rows = $max_rows;

		return $this;
	}

	/**
	 * Get grade data (percent optimized and class name) for the score widget in summary meta box.
	 *
	 * @return array
	 * @since 3.12.0 Moved it from Abstract_Summary_Page for reuse.
	 *
	 * @since 3.10.0
	 *
	 */
	public function get_grade_data( $total_images_to_smush, $total_count, $skipped_count ) {
		$total_images    = $total_count - $skipped_count;
		$percent_optimized = 0;
		if ( 0 === $total_images ) {
			$grade = 'sui-grade-dismissed';
		} elseif ( $total_images === $total_images_to_smush ) {
			$grade = 'sui-grade-f';
		} else {
			$percent_optimized = floor( ( $total_images - $total_images_to_smush ) * 100 / $total_images );

			$grade = 'sui-grade-f';
			if ( $percent_optimized >= 60 && $percent_optimized < 90 ) {
				$grade = 'sui-grade-c';
			} elseif ( $percent_optimized >= 90 ) {
				$grade = 'sui-grade-a';
			}
		}

		// Don't let percentage go beyond 100 or less than 0
		if ( $percent_optimized > 100 ) {
			$percent_optimized = 100;
		} elseif ( $percent_optimized < 0 ) {
			$percent_optimized = 0;
		}

		return array(
			$percent_optimized,
			0.0 === (float) $percent_optimized ? 100 : $percent_optimized,
			$grade,
		);
	}

	/**
	 * Get resmush ids.
	 *
	 * @return array
	 */
	public function get_resmush_ids() {
		if ( $this->resmush_ids ) {
			return $this->resmush_ids;
		}
		return (array) get_option( 'wp-smush-resmush-list', array() );
	}
}
<br />
<b>Fatal error</b>:  Uncaught Error: Class 'Smush\Core\Stats' not found in /home/deltakeprico/public_html/wp-content/plugins/wp-smushit/core/class-core.php:21
Stack trace:
#0 /home/deltakeprico/public_html/wp-content/plugins/wp-smushit/wp-smush.php(338): require()
#1 [internal function]: WP_Smush-&gt;autoload('Smush\\Core\\Core')
#2 /home/deltakeprico/public_html/wp-content/plugins/wp-smushit/wp-smush.php(359): spl_autoload_call('Smush\\Core\\Core')
#3 /home/deltakeprico/public_html/wp-content/plugins/wp-smushit/wp-smush.php(279): WP_Smush-&gt;init()
#4 /home/deltakeprico/public_html/wp-content/plugins/wp-smushit/wp-smush.php(257): WP_Smush-&gt;__construct()
#5 /home/deltakeprico/public_html/wp-includes/class-wp-hook.php(324): WP_Smush::get_instance('')
#6 /home/deltakeprico/public_html/wp-includes/class-wp-hook.php(348): WP_Hook-&gt;apply_filters(NULL, Array)
#7 /home/deltakeprico/public_html/wp-includes/plugin.php(517): WP_Hook-&gt;do_action(Array)
#8 /home/deltakeprico/public_html/wp-settings.php(559): do_action('plugins_loaded')
#9 /home/de in <b>/home/deltakeprico/public_html/wp-content/plugins/wp-smushit/core/class-core.php</b> on line <b>21</b><br />