From cd5cb4b76775139dcc08a0f66376801bf99a1a18 Mon Sep 17 00:00:00 2001
From: Joseph Schorr <joseph.schorr@coreos.com>
Date: Sun, 28 Jun 2015 10:44:58 +0300
Subject: [PATCH] NPE fix

---
 endpoints/trigger.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/endpoints/trigger.py b/endpoints/trigger.py
index a0f945704..725b8aa1c 100644
--- a/endpoints/trigger.py
+++ b/endpoints/trigger.py
@@ -71,7 +71,7 @@ def _determine_build_ref(run_parameters, get_branch_sha, get_tag_sha, default_br
   kind = ''
   value = ''
 
-  if 'refs' in run_parameters:
+  if 'refs' in run_parameters and run_parameters['refs']:
     kind = run_parameters['refs']['kind']
     value = run_parameters['refs']['name']
   elif 'branch_name' in run_parameters: