get_splits returns none?

[Ryang20718]

def get_splits(symbol, info=None):
    """Returns the date, divisor, and multiplier for when a stock split occureed.

    :param symbol: The stock ticker.
    :type symbol: str
    :param info: Will filter the results to get a specific value. Possible options are \
    url, instrument, execution_date, divsor, and multiplier.
    :type info: Optional[str]
    :returns: [list] Returns a list of dictionaries. If info parameter is provided, \
    a list of strings is returned where the strings are the value \
    of the key that matches info.
    :Dictionary Keys: * url
                      * instrument
                      * execution_date
                      * multiplier
                      * divisor

    """
    try:
        symbol = symbol.upper().strip()
    except AttributeError as message:
        print(message, file=get_output())
        return None

    url = splits_url(symbol)
    data = request_get(url, 'results')
    return(filter_data(data, info))

if I run this func with TSLA, it returns none? is this API stale?