1 files changed, 1 insertions, 0 deletions
diff --git a/src/nvim/eval.c b/src/nvim/eval.c
index 498795dc38..d7f820ae78 100644
--- a/src/nvim/eval.c
+++ b/src/nvim/eval.c
@@ -2272,6 +2272,7 @@ static void set_var_lval(lval_T *lp, char_u *endp, typval_T *rettv, int copy, ch
       if (lp->ll_li->li_next == NULL) {
         /* Need to add an empty item. */
         list_append_number(lp->ll_list, 0);
+        assert(lp->ll_li->li_next);
       }
       lp->ll_li = lp->ll_li->li_next;
       ++lp->ll_n1;