There was a bug in the charting feature that prevented a chart from being rendered if there was only one observation in a cycle and the temperature of the observation was left blank.

It’s admittedly an edge case, and perhaps I’m exaggerating to call it a showstopper. However, it wasn’t making a good first impression for visitors who created a new account, created a cycle, and then added a blank observation to see what would happen.

The bug appears to be fixed.