Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_13 ( league INTEGER, club VARCHAR, play_offs VARCHAR )

### Question ###
Which of the lowest leagues had Aldershot town as a club when the play-offs number was less than 0?

### Accurate SQL ###

SELECT MIN(league) FROM table_name_13 WHERE club = "aldershot town" AND play_offs < 0