Chaining .spectral() after .common_time() for EnsembleSeries appears to cause a fatal error when applied to certain ensembles

[alexkjames]

Describe the bug
When applying .spectral() after .common_time() to the NOAA EnsembleSeries object from the working with age ensembles notebook, my jupyter kernel crashes.

To Reproduce
Run the pyleotutorials "working with age ensembles" notebook, and try to apply the .common_time().spectral() to MD982181.

Expected behavior
The kernel should not crash

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: Ventura 13.2
• Hardware: Apple M2 chihp

Additional context
This doesn't appear to be an issue with all ensemble series, only some of them.