(double-setup): Only copy `key-translation-map' if it is a keymap.

1 files changed, 3 insertions, 1 deletions

diff --git a/lisp/double.el b/lisp/double.el
index 8585f8716c8..7d318d9988a 100644
--- a/lisp/double.el
+++ b/lisp/double.el
@@ -145,7 +145,9 @@ but not `C-u X' or `ESC X' since the X is not the prefix key."
         ;; Set up key-translation-map as indicated by `double-map'.
         (kill-local-variable 'key-translation-map)
         (make-local-variable 'key-translation-map)
-        (setq key-translation-map (copy-keymap key-translation-map))
+        (setq key-translation-map (if (keymapp key-translation-map)
+                                      (copy-keymap key-translation-map)
+                                    (make-sparse-keymap)))
         (mapcar (function (lambda (entry)
                             (define-key key-translation-map
                               (vector (nth 0 entry))