From 1fcd410d4ae9b8dbe3cf5d340582f078abc7b2b4 Mon Sep 17 00:00:00 2001
From: juanvallejo <jvallejo@redhat.com>
Date: Thu, 12 Oct 2017 16:25:31 -0400
Subject: [PATCH] perform nil check before iterating over keys

---
 staging/src/k8s.io/client-go/tools/cache/delta_fifo.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/staging/src/k8s.io/client-go/tools/cache/delta_fifo.go b/staging/src/k8s.io/client-go/tools/cache/delta_fifo.go
index a71db60488..f06d1c5b1c 100644
--- a/staging/src/k8s.io/client-go/tools/cache/delta_fifo.go
+++ b/staging/src/k8s.io/client-go/tools/cache/delta_fifo.go
@@ -539,6 +539,10 @@ func (f *DeltaFIFO) Resync() error {
 	f.lock.Lock()
 	defer f.lock.Unlock()
 
+	if f.knownObjects == nil {
+		return nil
+	}
+
 	keys := f.knownObjects.ListKeys()
 	for _, k := range keys {
 		if err := f.syncKeyLocked(k); err != nil {