If a "first" rel is not specified in a Link header, the "first" button links to a literal null value.

[machawk1]

In #292, a "first" button is shown. Clicking this sends the user to https://matkelly.com/null. This is due to the Link header for this URI-R/URI-M (which in this case is one-in-the-same) of

Link: <http://matkelly.com/>; rel="original", <http://matkelly.com/archive/mkdc.tm>; rel="timemap"; type="application/link-format"

Note the lack of "first".

[machawk1]

This seems to be the result of the "first" button not being disabled by default in the HTML and not-so-much it being enabled:

Mink/mink-plugin/minkui.html

Lines 23 to 27 in 4d2d7c5

	<button id="memento_first" >First</button>
	<button id="memento_prev" disabled>Previous</button>
	&nbsp;&bull;&nbsp;
	<button id="memento_next" disabled>Next</button>
	<button id="memento_last" disabled>Last</button>