Does not work in text mode

[valrus]

Repro:
Create a document with the following:

трахаеш

Move point onto the word, M-x ahs-forward
Result: Wrong type argument: stringp, none

[valrus]

Full traceback:

Debugger entered--Lisp error: (wrong-type-argument stringp none)
  propertize(none face ahs-plugin-defalt-face)
  ahs-decorated-current-plugin-name()
  ahs-stat()
  (let* ((i 0) (overlay-count (length ahs-overlay-list)) (overlay (format "%s" (nth i ahs-overlay-list))) (current-overlay (format "%s" ahs-current-overlay)) (st (ahs-stat)) (plighter (ahs-current-plugin-prop (quote lighter))) (plugin (format " <%s> " (cond ((string= plighter "HS") "D") ((string= plighter "HSA") "B") ((string= plighter "HSD") "F")))) (propplugin (propertize plugin (quote face) (list (quote :foreground) "#ffffff" (quote :background) (face-attribute (quote ahs-plugin-defalt-face) :foreground))))) (while (not (string= overlay current-overlay)) (setq i (1+ i)) (setq overlay (format "%s" (nth i ahs-overlay-list)))) (let* ((x/y (format "[%s/%s]" (- overlay-count i) overlay-count)) (propx/y (propertize x/y (quote face) ahs-plugin-whole-buffer-face)) (hidden (if (< 0 (- overlay-count (nth 4 st))) "*" "")) (prophidden (propertize hidden (quote face) (quote (:weight bold))))) (echo "%s %s%s press (n/N) to navigate, (e) to edit, (r) to change range or (R) for reset" propplugin propx/y prophidden)))
  spacemacs/auto-highlight-symbol-overlay-map()
  ad-Advice-ahs-forward(#[nil "\300\301\302\"\207" [ahs-select ahs-forward-p t] 3 ("c:/Users/valrus/AppData/Roaming/.emacs.d/elpa/auto-highlight-symbol-20130313.243/auto-highlight-symbol.elc" . 36082) nil])
  apply(ad-Advice-ahs-forward #[nil "\300\301\302\"\207" [ahs-select ahs-forward-p t] 3 ("c:/Users/valrus/AppData/Roaming/.emacs.d/elpa/auto-highlight-symbol-20130313.243/auto-highlight-symbol.elc" . 36082) nil] nil)
  ahs-forward()
  (progn (spacemacs/integrate-evil-search t) (ahs-highlight-now) (ahs-forward))
  eval((progn (spacemacs/integrate-evil-search t) (ahs-highlight-now) (ahs-forward)) nil)
  spacemacs/quick-ahs-forward()
  call-interactively(spacemacs/quick-ahs-forward nil nil)
  command-execute(spacemacs/quick-ahs-forward)

[valrus]

Actually the problem might not be the non-ASCII; it might be that this is a text-mode buffer.