1 files changed, 3 insertions, 0 deletions

diff --git a/src/keymap.c b/src/keymap.c
index ed84063bcd3..1b2336562f2 100644
--- a/src/keymap.c
+++ b/src/keymap.c
@@ -616,6 +616,9 @@ the front of KEYMAP.")
           idx++;
         }
 
+      if (! INTEGERP (c) && ! SYMBOLP (c) && ! CONSP (c))
+        error ("Key sequence contains illegal events");
+
       if (idx == length)
         RETURN_UNGCPRO (store_in_keymap (keymap, c, def));