((not char)
;; Comment or docstring.
(if (nth 7 state) font-lock-doc-face font-lock-comment-face))
- ((and (char-valid-p char) (eq (char-syntax (nth 3 state)) ?\"))
+ ((and (characterp char) (eq (char-syntax (nth 3 state)) ?\"))
;; Normal string.
font-lock-string-face)
((eq (nth 3 state) ?\n)