It's somewhat similar to bpo-10811, but for converter function:

In [197]: import sqlite3 as sqlite
     ...: con = sqlite.connect(':memory:', detect_types=sqlite.PARSE_COLNAMES)
     ...: cur = con.cursor()
     ...: sqlite.converters['CURSOR_INIT'] = lambda x: cur.__init__(con)
     ...: 
     ...: cur.execute('create table test(x foo)')
     ...: cur.execute('insert into test(x) values (?)', ('foo',))
     ...: cur.execute('select x as "x [CURSOR_INIT]", x from test')
     ...: 
[1]    25718 segmentation fault  python manage.py shell

Similar to bpo-10811, proposed patch raises ProgrammingError instead of crashing.