Navigate to https://nextstrain.org/pathogens?filter=ncov (for example).

Click on one of the many "turn back the clock" links with an n= in several hundreds, e.g. ncov/gisaid/africa/1m's "every few days (n=455)". Note that it opens the previous versions modal as expected. Close the modal.

Click on one of the same "turn back the clock" links with a higher n=, e.g. ncov/gisaid/africa/2m's n=616 or …/6m's n=1119. Note that it crashes the list resources component with the error:

Something isn't working! Error: `Unknown error (thrown value was not an InternalError)`

Reproducing this locally, I see the underlying error is:

TypeError: can't access property Symbol.iterator, items is undefined

from inside d3 and implicates our code at:

This points to beeswarmData being undefined, which makes sense as possible since it starts as undefined and may not ever be defined before the iterative sizing algorithm gives up: