Er is een fout opgetreden in de query:

Query = SELECT *, main.* , AS main_id , AS edit_id FROM portfolio AS main LEFT JOIN portfolio AS tv ON AND tv.taalversie='en' INNER JOIN portfolio_images ON WHERE main.taalversie='nl' AND main.portfolio='1' GROUP BY ORDER BY main.datum DESC, DESC

Foutmelding = Expression #16 of SELECT list is not in GROUP BY clause and contains nonaggregated column '' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by