Zero for bars' vw/n values

I know the `vw` and `n` values for bars are not officially released, but from the days+tickers I have downloaded, 86 thousand have at least one bar with zero for either vwap or number of trades.

Example: https://data.alpaca.markets/v2/stocks/MCO/bars?start=2020-04-08T00:00:00Z&end=2020-04-09T00:00:00Z&limit=100&timeframe=1Min

I can give you a list of all if it helps. But I suspect you can just query your database for it.