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MySQL server has gone away SQL Query: SELECT DISTINCT art_Content.productcode as productcode, IF(art_Content.virtueel < 1, art_Stock.voorraad, art_Content.virtueel) AS voorraad,art_Content.merk, art_Campagne_Producten.campagne, art_Content.model, art_productsubgroepen.subgroepid, art_Content.kleur, art_Stock.prijsvoor, art_Stock.maatid, art_Content.pasvorm, art_Content.patroon, art_Content.mouwlengte, art_MateriaalKoppeling.materiaal, art_Content.extralabel, art_Content.doelgroep, art_Content.geslacht, art_Content.nieuw, IF (art_Stock.prijsvoor < art_Stock.prijsvan, 1, 0 ) AS sale FROM art_Content LEFT JOIN art_Stock ON art_Stock.productid=art_Content.ean LEFT JOIN art_Merken ON art_Content.merk = art_Merken.id LEFT JOIN art_productsubgroepen ON (art_productsubgroepen.productcode = art_Content.productcode) LEFT JOIN art_Campagne_Producten ON art_Content.productcode = art_Campagne_Producten.product LEFT JOIN art_MateriaalKoppeling ON (art_MateriaalKoppeling.productcode = art_Content.productcode) LEFT JOIN art_Materiaal ON (art_Materiaal.id = art_MateriaalKoppeling.materiaal) WHERE (art_Stock.voorraad > 0 AND art_Stock.maatid<>0 OR art_Content.virtueel=1) AND (art_Content.thema_VM2019='1' OR art_Content.thema_uni='1')AND art_Content.doelgroep IN (SELECT DISTINCT art_Doelgroep.id FROM art_Doelgroep WHERE toon = 1 AND seonaam_in_menu_url = 0)