@@ -137,7 +137,7 @@ static void free_field_queue(PullupField *head)

         av_free(f->combs);

         av_free(f->vars);

         next = f->next;

-        memset(f, 0, sizeof(*f));

+        memset(f, 0, sizeof(*f)); // clear all pointers to avoid stale ones

         av_free(f);

         f = next;

     } while (f != head);