1 files changed, 2 insertions, 1 deletions

diff --git a/lisp/term/tty-colors.el b/lisp/term/tty-colors.el
index 03fef2a3421..1fe98192540 100644
--- 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))