Merge pull request #6922 from influxdata/jw-6829

Fix panic: runtime error: index out of range

CHANGELOG.md

@@ -76,6 +76,7 @@ With this release the systemd configuration files for InfluxDB will use the syst
 - [#6864](https://github.com/influxdata/influxdb/pull/6864): Allow a non-admin to call "use" for the influx cli.
 - [#6855](https://github.com/influxdata/influxdb/pull/6855): Update `stress/v2` to work with clusters, ssl, and username/password auth. Code cleanup
 - [#6738](https://github.com/influxdata/influxdb/issues/6738): Time sorting broken with overwritten points
+- [#6829](https://github.com/influxdata/influxdb/issues/6829): Fix panic: runtime error: index out of range
 
 ## v0.13.0 [2016-05-12]
 

tsdb/engine/tsm1/cache.go

@@ -413,7 +413,7 @@ func (c *Cache) merged(key string) Values {
 	n := 0
 	for _, e := range entries {
 		e.mu.RLock()
-		if !needSort && n > 0 {
+		if !needSort && n > 0 && len(e.values) > 0 {
 			needSort = values[n-1].UnixNano() >= e.values[0].UnixNano()
 		}
 		n += copy(values[n:], e.values)