[pysqlite] [APSW] "SQLError: cannot rollback - no transaction is active"

Hello

Out of curiosity, why does APSW raise this error in this try/except block?

=========
cursor.execute("BEGIN")
for name, pattern in patterns:
	m = pattern.search(content)
	if m:
		value = m.group(1).strip()
		sql = 'UPDATE membres SET %s="%s" WHERE id=%s' % (name,value,id)
		sql = sql.decode('iso-8859-1')
		try:
			cursor.execute(sql)
		except:
			print "Failed %s" % sql
			connection.close(True)
			sys.exit()
try:
	cursor.execute("COMMIT")
	time.sleep(1)
except:
	print "Failed %s" % sql
	File "src/cursor.c", line 230, in resetcursor apsw.SQLError: 
SQLError: cannot rollback - no transaction is active
	cursor.execute("ROLLBACK")
	connection.close(True)
	sys.exit()
=========

Since the COMMIT failed, I assumed the ROLLBACK would be ran in the 
except section that follows.

Thank you.