SELECT SUM(c.summe), SUM(c.gewicht),SUM(c.quantity) FROM cart AS c LEFT JOIN artikel_daten AS ad ON c.artikel_id = ad.id LEFT JOIN seiten AS s ON ad.id = s.id LEFT JOIN user AS b ON s.seiten_besitzer = b.user_id WHERE c.session_id = 'de1a0ea6cecef92934017eb3aefc7a55' MySQL server has gone away