Debugger entered--Lisp error: (wrong-type-argument integer-or-marker-p nil)
  apply(debug error (wrong-type-argument integer-or-marker-p nil))
  edebug(error (wrong-type-argument integer-or-marker-p nil))
  narrow-to-region(nil nil)
  (edebug-after (edebug-before 55) 58 (narrow-to-region (edebug-after 0 56 beg) (edebug-after 0 57 end)))
  (let (beg end at msg) (edebug-after (edebug-before 5) 51 (cond ... ... ...)) (edebug-after (edebug-before 52) 54 (message ... "")) (edebug-after (edebug-before 55) 58 (narrow-to-region ... ...)) (edebug-after (edebug-before 59) 61 (goto-char ...)) (edebug-after (edebug-before 62) 73 (org-format-latex ... ... ... ... ... ... ...)) (edebug-after (edebug-before 74) 76 (message ... "done.  Use `C-c C-c' to remove images.")))
  (edebug-after (edebug-before 4) 77 (let (beg end at msg) (edebug-after ... 51 ...) (edebug-after ... 54 ...) (edebug-after ... 58 ...) (edebug-after ... 61 ...) (edebug-after ... 73 ...) (edebug-after ... 76 ...)))
  (save-restriction (edebug-after (edebug-before 4) 77 (let ... ... ... ... ... ... ...)))
  (edebug-after (edebug-before 3) 78 (save-restriction (edebug-after ... 77 ...)))
  (save-excursion (edebug-after (edebug-before 3) 78 (save-restriction ...)))
  (edebug-after (edebug-before 2) 79 (save-excursion (edebug-after ... 78 ...)))
  (lambda nil (edebug-after (edebug-before 0) 1 (org-remove-latex-fragment-image-overlays)) (edebug-after (edebug-before 2) 79 (save-excursion ...)))()
  edebug-enter(org-preview-latex-fragment-region (1 9 nil) (lambda nil (edebug-after (edebug-before 0) 1 (org-remove-latex-fragment-image-overlays)) (edebug-after (edebug-before 2) 79 (save-excursion ...))))
  edebug-enter(org-preview-latex-fragment-region (1 9 nil) (lambda nil (edebug-after (edebug-before 0) 1 (org-remove-latex-fragment-image-overlays)) (edebug-after (edebug-before 2) 79 (save-excursion ...))))
  org-preview-latex-fragment-region(1 9)
  call-interactively(org-preview-latex-fragment-region)
  command-execute(org-preview-latex-fragment-region t)
  execute-extended-command(nil)
  call-interactively(execute-extended-command)
  recursive-edit()
  byte-code("..." [buffer-read-only noninteractive debugger-buffer middlestart debugger-args debugger-batch-max-lines pop-to-buffer debugger-mode debugger-setup-buffer count-lines 2 "...\n" message buffer-string kill-emacs debug backtrace-debug 3 t debugger-reenable "" nil recursive-edit standard-output] 3)
  debug(error (wrong-type-argument integer-or-marker-p nil))
  org-preview-latex-fragment-region(1855 1873)
  call-interactively(org-preview-latex-fragment-region)
  command-execute(org-preview-latex-fragment-region t)
  execute-extended-command(nil)
  call-interactively(execute-extended-command)