A Database Error Occurred

Error Number: 1055

Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'freegames4rest.games_category.category' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

SELECT `game_id`, `category` FROM (`games_category`) WHERE `game_id` IN ('shadow_wolf_mysteries_bane_of_the_family', 'solitaire_egypt', 'big_bang_west', 'art_mahjong_egypt', 'royal_settlement_1450', 'vampire_secrets_eternal_love', 'shamanville_earth_heart', 'asian_mahjong', 'tripps_adventures', 'seven_seas_solitaire', 'brink_of_consciousness_lonely_hearts_ce', 'tower_of_elements', 'zodiac_prophecies_the_serpent_bearer', 'rune_stones_quest', 'mystery_ancients_curse_of_the_black_water_ce', 'twilight_city_love_as_a_cure', 'wings_of_horus', 'vegas_penny_slots_3', 'the_great_unknown_houdinis_castle_ce', 'sylia_act_1', 'witch_hunters_stolen_beauty') GROUP BY `game_id`