(xmenu_show): Don't cons on subprefix_stck[j] if nil.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/xmenu.c b/src/xmenu.c
index 9614e752430..83f559a1fdc 100644
--- a/src/xmenu.c
+++ b/src/xmenu.c
@@ -1727,7 +1727,8 @@ xmenu_show (f, x, y, menubarp, keymaps, title, error)
                       if (!NILP (prefix))
                         entry = Fcons (prefix, entry);
                       for (j = submenu_depth - 1; j >= 0; j--)
-                        entry = Fcons (subprefix_stack[j], entry);
+                        if (!NILP (subprefix_stack[j], entry))
+                          entry = Fcons (subprefix_stack[j], entry);
                     }
                   return entry;
                 }