From 04361374b06d84aa75d53ce5b64abd56f6a2a5aa Mon Sep 17 00:00:00 2001
From: Leigh B Stoller <stoller@flux.utah.edu>
Date: Mon, 23 Oct 2017 07:07:56 -0600
Subject: [PATCH] Watch for null slice URN, it can happen.

---
 apt/create_instance.in | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/apt/create_instance.in b/apt/create_instance.in
index 4ed94fd47..3cce0c30b 100755
--- a/apt/create_instance.in
+++ b/apt/create_instance.in
@@ -711,6 +711,9 @@ my $slice_id    = (defined($userslice_id) ? $userslice_id :
 my $slice_auth  = ($pid eq $gid ? $pid : "${pid}:${gid}");
 my $slice_urn   = GeniHRN::Generate("${OURDOMAIN}:${slice_auth}",
 				    "slice", $slice_id);
+if (!defined($slice_urn)) {
+    fatal("Could not generate a valid slice urn!");
+}
 my $slice_hrn   = "${PGENIDOMAIN}.${pid}.${slice_id}";
 my $SERVER_NAME = (exists($ENV{"SERVER_NAME"}) ? $ENV{"SERVER_NAME"} : "");
 
-- 
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