Date search in sqlite not working

I'm trying to search a database for tomorrows date which then proceeds to an email function.

def send_email():
currentdate = time.strftime("%d/%m/%Y")
nextday = datetime.date.today() + datetime.timedelta(days=1)
tomorrow = str(nextday.strftime("%d %m %Y"))
with sqlite3.connect("school.db") as db:
    cursor = db.cursor()
    cursor.execute("SELECT DateIn FROM MusicLoan WHERE DateIn = ?",(tomorrow,))
    row = cursor.fetchall()[0]
    if str(row) == str(currentdate):
        cursor.execute("SELECT StudentID FROM MusicLoan WHERE DateIn = ?", (currentdate))
        ID = cursor.fetcone()[0]
        cursor.execute("SELECT email FROM Student WHERE StudentID = ?",(ID))
        email = cursor.fetchone()[0]
        fromaddr = email
        toaddr = "danielarif@blueyonder.co.uk"
        msg = MIMEMultipart()
        msg['From'] = fromaddr
        msg['To'] = toaddr
        msg['Subject'] = "Music Reminder"
        body = "A reminder that your music is due in tomorrow"
        msg.attach(MIMEText(body, 'plain'))
        try:
            server = smtplib.SMTP('smtp.gmail.com', 587)
            server.ehlo()
            server.set_debuglevel(1)
            server.starttls()
            server.ehlo()
            server.login("danielarif123@gmail.com", "DanR0bJ0nes3")
            text = msg.as_string()
            server.sendmail(fromaddr, toaddr, text)
            server.quit()
            print("Email Sent Successfully")
            send_email()
        except smtplib.SMTPException:
            print ("Error: unable to send email")
            send_email()

my problem is is that it gets to the row = cursor.fetchall()[0] and then stops. How can I fix this