Incorrect stock data?

The following code consistently reports a low of zero for POWL on April 30th, 2018. Can anybody provide a reasonable explanation why this might be? Thank you!

Python code:
import alpaca_trade_api as tradeapi
import datetime as dt
api = tradeapi.REST(omitted, omitted, omitted)
barset = api.get_barset(‘POWL’, ‘day’, start=‘2020-01-01’, end=dt.date.today().isoformat(), limit=1000)
print(barset[‘POWL’][292]._raw[‘l’])
print(barset[‘POWL’][292]._raw[‘t’])

Returns:
0
1525060800