From 2d8829d751e551161bd2249d32d02380d40ccac8 Mon Sep 17 00:00:00 2001
From: Fabian Reinartz <fab.reinartz@gmail.com>
Date: Thu, 19 Nov 2015 13:49:32 +0100
Subject: [PATCH] Remove data race from alert subscription

---
 provider/sql.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/provider/sql.go b/provider/sql.go
index 45a7249a..921e147a 100644
--- a/provider/sql.go
+++ b/provider/sql.go
@@ -216,7 +216,9 @@ func (a *SQLAlerts) Subscribe() AlertIterator {
 	i := a.next
 	a.next++
 
+	a.mtx.Lock()
 	a.listeners[i] = ch
+	a.mtx.Unlock()
 
 	go func() {
 		defer func() {