);
		}
	}

	/**
	 * Determine if migration is allowed.
	 *
	 * @since 1.7.5
	 */
	private function is_allowed(): bool {

		// phpcs:ignore WordPress.Security.NonceVerification.Recommended
		if ( isset( $_GET['service-worker'] ) ) {
			return false;
		}

		return wp_doing_cron() || is_admin() || wpforms_doing_wp_cli();
	}

	/**
	 * Maybe create custom plugin tables.
	 *
	 * @since 1.7.6
	 */
	public function maybe_create_tables() {

		if ( $this->tables_check_done ) {
			/**
			 * We should do tables check only once - when the first migration has been started.
			 * The DB::get_existing_custom_tables() without caching causes performance issue
			 * on huge multisite with thousands of tables.
			 */
			return;
		}

		// We need actual information about existing tables, so drop the cache.
		Transient::delete( DB::EXISTING_TABLES_TRANSIENT_NAME );

		$custom_tables = DB::get_existing_custom_tables();

		foreach ( static::CUSTOM_TABLE_HANDLER_CLASSES as $custom_table_handler_class ) {
			if ( ! class_exists( $custom_table_handler_class ) ) {
				continue;
			}

			$custom_table_handler = new $custom_table_handler_class();

			if ( ! in_array( $custom_table_handler->table_name, $custom_tables, true ) ) {
				$custom_table_handler->create_table();
			}
		}

		$this->tables_check_done = true;
	}

	/**
	 * Maybe convert the migration option format.
	 *
	 * @since 1.7.5
	 */
	private function maybe_convert_migration_option() {

		/**
		 * Retrieve the migration option and check its format.
		 * Old format: a string 'x.y.z' containing the last migrated version.
		 * New format: [ 'x.y.z' => {status}, 'x1.y1.z1' => {status}... ],
		 * where {status} is a migration status.
		 * Negative means some status (-1 for 'started' etc.),
		 * zero means completed earlier at unknown time,
		 * positive means completion timestamp.
		 */
		$this->migrated = get_option( static::MIGRATED_OPTION_NAME );

		// If the option is an array, it means that it is already converted to the new format.
		if ( is_array( $this->migrated ) ) {
			return;
		}

		/**
		 * Convert the option to the new format.
		 *
		 * Old option names contained 'version',
		 * like 'wpforms_version', 'wpforms_version_lite', 'wpforms_stripe_version' etc.
		 * We preserve old options for downgrade cases.
		 * New option names should contain 'versions' and be like 'wpforms_versions' etc.
		 */
		$this->migrated = get_option(
			str_replace( 'versions', 'version', static::MIGRATED_OPTION_NAME )
		);

		$version        = $this->migrated === false ? self::INITIAL_FAKE_VERSION : (string) $this->migrated;
		$timestamp      = $version === static::CURRENT_VERSION ? time() : 0;
		$this->migrated = [ $version => $timestamp ];
		$max_version    = $this->get_max_version( $this->migrated );

		foreach ( $this->get_upgrade_classes() as $upgrade_class ) {
			$upgrade_version = $this->get_upgrade_version( $upgrade_class );

			if (
				! isset( $this->migrated[ $upgrade_version ] ) &&
				version_compare( $upgrade_version, $max_version, '<' )
			) {
				$this->migrated[ $upgrade_version ] = 0;
			}
		}

		unset( $this->migrated[ self::INITIAL_FAKE_VERSION ] );

		ksort( $this->migrated );

		update_option( static::MIGRATED_OPTION_NAME, $this->migrated );
	}

	/**
	 * Get the max version.
	 *
	 * @since 1.7.5
	 *
	 * @param array $versions Versions.
	 *
	 * @return string
	 */
	private function get_max_version( array $versions ): string {

		// phpcs:ignore WPForms.Formatting.EmptyLineBeforeReturn.RemoveEmptyLineBeforeReturnStatement
		return array_reduce(
			array_keys( $versions ),
			static function ( $carry, $version ) {

				return version_compare( $version, $carry, '>' ) ? $version : $carry;
			},
			self::INITIAL_FAKE_VERSION
		);
	}

	/**
	 * Determine if it is the core plugin (Lite or Pro).
	 *
	 * @since 1.7.5
	 *
	 * @return bool True if it is the core plugin.
	 */
	protected function is_core_plugin(): bool {

		// phpcs:ignore WPForms.Formatting.EmptyLineBeforeReturn.RemoveEmptyLineBeforeReturnStatement
		return strpos( static::MIGRATED_OPTION_NAME, 'wpforms_versions' ) === 0;
	}

	/**
	 * Log migration message.
	 *
	 * @since 1.8.2.3
	 *
	 * @param bool   $migrated        Migration status.
	 * @param string $plugin_name     Plugin name.
	 * @param string $upgrade_version Upgrade version.
	 *
	 * @return void
	 */
	private function log_migration_message( bool $migrated, string $plugin_name, string $upgrade_version ) {

		$message = $migrated ?
			sprintf( 'Migration of %1$s to %2$s completed.', $plugin_name, $upgrade_version ) :
			sprintf( 'Migration of %1$s to %2$s failed.', $plugin_name, $upgrade_version );

		$this->log( $message );
	}
}
<br />
<b>Fatal error</b>:  Uncaught Error: Class 'WPForms\Migrations\Base' not found in /home/candoodesigncom/public_html/wp-content/plugins/wpforms-lite/src/Migrations/Migrations.php:14
Stack trace:
#0 /home/candoodesigncom/public_html/wp-content/plugins/seo-by-rank-math-pro/vendor/composer/ClassLoader.php(571): include()
#1 /home/candoodesigncom/public_html/wp-content/plugins/seo-by-rank-math-pro/vendor/composer/ClassLoader.php(428): Composer\Autoload\includeFile('/home/candoodes...')
#2 [internal function]: Composer\Autoload\ClassLoader-&gt;loadClass('WPForms\\Migrati...')
#3 [internal function]: spl_autoload_call('WPForms\\Migrati...')
#4 /home/candoodesigncom/public_html/wp-content/plugins/wpforms-lite/src/WPForms.php(307): class_exists('\\WPForms\\Migrat...')
#5 /home/candoodesigncom/public_html/wp-content/plugins/wpforms-lite/src/WPForms.php(365): WPForms\WPForms-&gt;register(Array)
#6 /home/candoodesigncom/public_html/wp-content/plugins/wpforms-lite/src/Loader.php(30): WPForms\WPForms-&gt;register_bulk(Array)
#7 /home/candoodesigncom/pu in <b>/home/candoodesigncom/public_html/wp-content/plugins/wpforms-lite/src/Migrations/Migrations.php</b> on line <b>14</b><br />