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 ('weather_lord_2_hidden_realm', 'outta_this_kingdom', 'viking_brothers', 'sacra_terra_kiss_of_death_se', 'gardens_inc_from_rakes_to_riches', 'lake_house_children_of_silence_collectors_edition', 'forbidden_secrets_alien_ce', 'age_of_adventure_playing_the_hero', 'lost_head', 'war_in_a_box_paper_tanks', 'eternal_journey_new_atlantis_game', 'twisted_lands_origin', 'kingdom_chronicles', 'natural_thread_ominous_shores', 'the_promised_land', 'pearl_harbor_fire_on_the_water', 'snark_busters_3', 'dark_strokes_sins_fathers', 'house_of_1000_doors_the_palm_of_zoroaster', 'vampire_saga_3_break_out', 'elementary_my_dear_majesty') GROUP BY `game_id`