Infinitiy NumberFormatException when creating BigDecimal

I have a function that formats a float value into USD currency format, but when the values are fractions of a dollar they get formatted to the last two non-zero decimals.

public static String currency(float number) {

    NumberFormat currencyFormatter = NumberFormat.getCurrencyInstance();
    currencyFormatter.setCurrency(Currency.getInstance("USD"));

    String[] floatParts = new BigDecimal(number).toPlainString().split("\\.");

    if(number < 1 && floatParts.length == 2) {

        String decimalPortion = floatParts[1];
        int numDecimalPlaces = 0;
        while (decimalPortion.charAt(numDecimalPlaces) == '0')
            numDecimalPlaces++;

        if(numDecimalPlaces > 2)
            currencyFormatter.setMaximumFractionDigits(numDecimalPlaces + 2);
        else
            currencyFormatter.setMaximumFractionDigits(2);

    } else {
        currencyFormatter.setMaximumFractionDigits(2);
    }

    return currencyFormatter.format(number);
}

I'm using Firebase Crashlytics and I'm getting this exception:

java.lang.NumberFormatException, Infinity or NaN: Infinity, exception at:

    String[] floatParts = new BigDecimal(number).toPlainString().split("\\.");

What is causing this excpetion? If a non-numerical value was passed to this function, wouldn't the exception occur prior to reaching this line of code?

EDIT

The calling method:

@SerializedName("current_price")
@Expose
@ColumnInfo(name = "current_price")
private float currentPrice;

public void setCurrentPrice(float currentPrice) {

    if(currentPrice < 0.0001) {
        priceName = "$" + NumberFormatter.roundToLastDecimalDigits(currentPrice, 3);
    } else {
        priceName = NumberFormatter.currency(currentPrice);
    }

    this.currentPrice = currentPrice;
}