Thanks for org-habit, it is a very nice feature! When the last DONE date is earlier than `org-habit-preceding-days' the graph can not be rendered due to error in org-habit-build-graph.
I have tracked down the problem (calling time-less-p on nil when done-dates is empty) and the following patch is solving the issue for me but I am not sure if this is how you intended it.
diff --git a/lisp/org-habit.el b/lisp/org-habit.el index 6ba2097..26de1b0 100644 --- a/lisp/org-habit.el +++ b/lisp/org-habit.el @@ -278,10 +278,9 @@ Habits are assigned colors on the following basis: (graph (make-string (1+ (- (time-to-days ending) (time-to-days starting))) ?\ )) (index 0)) - (if done-dates - (while (time-less-p (car done-dates) starting) - (setq last-done-date (car done-dates) - done-dates (cdr done-dates)))) + (while (and done-dates (time-less-p (car done-dates) starting)) + (setq last-done-date (car done-dates) + done-dates (cdr done-dates))) (while (time-less-p day ending) (let* ((now-days (time-to-days day)) (in-the-past-p (< now-days current-days))
-- Mikael Fornius
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