1 files changed, 1 insertions, 0 deletions

diff --git a/src/keymap.c b/src/keymap.c
index 7fe8718aa09..fbbbcae3998 100644
--- a/src/keymap.c
+++ b/src/keymap.c
@@ -311,6 +311,7 @@ int
 keymap_memberp (map, maps)
      Lisp_Object map, maps;
 {
+  if (NILP (map)) return 0;
   while (KEYMAPP (maps) && !EQ (map, maps))
     maps = Fkeymap_parent (maps);
   return (EQ (map, maps));