1 files changed, 1 insertions, 1 deletions
diff --git a/auth/auth.c b/auth/auth.c
index 29c9fd8d..925f790f 100644
--- a/auth/auth.c
+++ b/auth/auth.c
@@ -83,7 +83,7 @@ idvec_copyout (struct idvec *idvec, uid_t **ids, size_t *nids)
 {
   if (idvec->num > *nids)
     *ids = idvec->ids;
-  else
+  else if (idvec->num)
     memcpy (*ids, idvec->ids, idvec->num * sizeof *ids);
   *nids = idvec->num;
 }