Invalid query:
Unknown column 'answer.frontend' in 'field list'

Whole query:
SELECT answer.id, answer.id_woice_question, answer.sel_extra, answer.azione, answer.id_sez_target, answer.ck_extra,answer.target_transf,answer.frontend, text.text, text.extra, text.messaggio, text.ck_audio_messaggio, text.audio_file, text.tags FROM woice_poll_answer as answer LEFT JOIN woice_poll_answer_ML as text ON answer.id = text.id_woice_answer WHERE text.lang =1 AND answer.id_woice_question = 868 ORDER BY answer.id