Error when a selector ID includes a space

The stock quote in the HTML for this page,

https://www.google.com/finance/quote/TCAP:BKK

is within the following div :

<div class="YMlKec fxKbKc">
฿38.50
</div>

If I try to extract the content of this div using htmlq and a command like:

curl -X 'GET' 'https://www.google.com/finance/quote/TCAP:BKK?hl=en'| htmlq div[class="YMlKec fxKbKc"] --text

I get the following error:

thread 'main' panicked at 'Failed to parse CSS selector: ()', /root/.cargo/registry/src/github.com-1ecc6299db9ec823/htmlq-0.4.0/src/main.rs:248:10
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

After trying to extract the stock quote with htmlq using approaches that use the same selector, but in different ways, it's pretty clear to me that htmlq doesn't work right when the selector ID has a space in it.

Or am I missing something?