diff --git a/grub-core/script/execute.c b/grub-core/script/execute.c
index b88765f1d..25158407d 100644
--- a/grub-core/script/execute.c
+++ b/grub-core/script/execute.c
@@ -624,6 +624,9 @@ grub_script_arglist_to_argv (struct grub_script_arglist *arglist,
   struct grub_script_arg *arg = 0;
   struct grub_script_argv result = { 0, 0, 0 };
 
+  if (arglist == NULL)
+    return 1;
+
   for (; arglist && arglist->arg; arglist = arglist->next)
     {
       if (grub_script_argv_next (&result))