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 ('princess_isabella_the_rise_of_an_heir_se', 'empress_of_the_deep_3_legacy_of_the_phoenix', 'infected_the_twin_vaccine', 'theatre_of_the_absurd', 'shannon_tweeds_attack_of_the_groupies', 'empress_of_deep_2_song_of_the_blue_whale', 'voodoo_whisperer_curse_of_legend', 'twisted_a_haunted_carol', 'millionaire_manor_the_hidden_object_show', 'robins_quest_a_legend_is_born', 'secrets_of_the_dragon_wheel', 'vaultcracker_the_last_safe', 'escape_the_lost_kingdom', 'the_forgotten_pharaoh', 'happyville_quest_for_utopia', 'the_clumsys_2_butterfly_effect', 'princess_isabella_a_witchs_curse', 'nanny_mania_2') GROUP BY `game_id`