From 4e087165aa4844948dbfe1c28b8da2b0b6905eba Mon Sep 17 00:00:00 2001
From: Fabian Reinartz <fab.reinartz@gmail.com>
Date: Wed, 25 May 2016 16:59:16 -0700
Subject: [PATCH] retrieval: handle nil target groups from updates

---
 retrieval/targetmanager.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/retrieval/targetmanager.go b/retrieval/targetmanager.go
index 0478875cb..2a25c48f2 100644
--- a/retrieval/targetmanager.go
+++ b/retrieval/targetmanager.go
@@ -288,6 +288,9 @@ func (ts *targetSet) runProviders(ctx context.Context, providers map[string]Targ
 				}
 				// First set of all targets the provider knows.
 				for _, tgroup := range initial {
+					if tgroup == nil {
+						continue
+					}
 					targets, err := targetsFromGroup(tgroup, ts.config)
 					if err != nil {
 						log.With("target_group", tgroup).Errorf("Target update failed: %s", err)
@@ -333,6 +336,9 @@ func (ts *targetSet) runProviders(ctx context.Context, providers map[string]Targ
 
 // update handles a target group update from a target provider identified by the name.
 func (ts *targetSet) update(name string, tgroup *config.TargetGroup) error {
+	if tgroup == nil {
+		return nil
+	}
 	targets, err := targetsFromGroup(tgroup, ts.config)
 	if err != nil {
 		return err