Very old date appears in ticks

Hi,

Sometimes I am receiving this date as timestamp of one of the ticks. KeyError: datetime.datetime(1970, 1, 1, 5, 30). I am subscribing Bank Nifty options, Bank Nifty and Bank Nifty futures. This date completely breaks my logic where I try to form one minute candle.

Is there any chance such a timestamp can appear?

Thanks.