diff --git a/lib/vty.c b/lib/vty.c
index 98f6494..7696915 100644
--- a/lib/vty.c
+++ b/lib/vty.c
@@ -1062,7 +1062,8 @@
 
 out:
   cmd_free_strvec (vline);
-  vector_free (describe);
+  if (describe)
+    vector_free (describe);
 
   vty_prompt (vty);
   vty_redraw_line (vty);