Evening,

If attempting to capture something while global-whitespace-mode is
enabled, a second capture will fail with "Marker does not point
anywhere".  The first capture attempt presumably succeeds since
whitespace-mode didn't touch the buffer yet at time of searching.
Reproduction steps:

(in an org-mode.git clone)

1. emacs -Q --execute '(global-whitespace-mode)' -L lisp/
2. M-x org-capture RET t C-c C-c
2. M-x org-capture RET t

I'm uncertain if this is relevant, but I just spotted that *Warnings*
also gets:

  Warning (org): Capture requirement: switching buffer #<buffer .notes>
  to Org mode

Backtrace: