Don't count colors without RGB values as gray shades.

diff --git a/lisp/term/tty-colors.el b/lisp/term/tty-colors.el
index 03fef2a34215347869b909707b31cb647fe296d1..1fe9819254069224bbf4cdf651443de66cddbe06 100644 (file)
--- a/lisp/term/tty-colors.el
+++ b/lisp/term/tty-colors.el
@@ -971,7 +971,8 @@ A color is considered gray if the 3 components of its RGB value are equal."
            r (car desc)
            g (cadr desc)
            b (car (cddr desc)))
-      (and (eq r g) (eq g b)
+      (and (numberp r)
+          (eq r g) (eq g b)
           (setq count (1+ count)))
       (setq colors (cdr colors)))
     count))