MySQL: Insert record if not exists in table

I am trying to execute the following query: INSERT INTO table_listnames (name, address, tele) VALUES ('Rupert', 'Somewhere', '022') WHERE NOT EXISTS ( SELECT name FROM table_listnames WHERE name='value' ); But this returns an error. Basically I don't want to insert a record if the 'name' field of the record already exists in another record - how to check if the new name is unique?