Dew shows 'NaN' ? What's the problem?

My web display is showing Dew point : Nan. What does that mean?

Hello Nick

Can you please give us some more details, maybe your public page where we can have a look at what your station is doing …
Nan means basically it can’t give you some result by lack of data …

NaN means Not a Number - ie. it received data which was not numerical as it was expecting, so it is unable to process and display it.

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That’s a bug in the code. Post a screen shot so @corrineb can find and fix it.

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I pushed an update to the web app that will safeguard against the NaN display. If you see the issue again just let me know. Thanks!