MySQL-Query failed:

• ErrorNo = 1055
• Error = Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'db_202557_1.users.id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
• Query = SELECT id,city,gmaps_koord,country FROM users WHERE level > 1 AND level != 0 AND city != '' AND gmaps_koord != '' GROUP BY gmaps_koord