From 3ea66ebe3fb7c2a0ece248f1c7fc524f225d8234 Mon Sep 17 00:00:00 2001
From: bergquist <carl.bergquist@gmail.com>
Date: Thu, 17 Nov 2016 15:20:14 +0100
Subject: [PATCH] fix(alerting): remove possible divide by zero panic

ref #6599
---
 pkg/services/alerting/scheduler.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkg/services/alerting/scheduler.go b/pkg/services/alerting/scheduler.go
index b6ef1a63ff8..151f802ec15 100644
--- a/pkg/services/alerting/scheduler.go
+++ b/pkg/services/alerting/scheduler.go
@@ -39,6 +39,9 @@ func (s *SchedulerImpl) Update(rules []*Rule) {
 
 		offset := ((rule.Frequency * 1000) / int64(len(rules))) * int64(i)
 		job.Offset = int64(math.Floor(float64(offset) / 1000))
+		if job.Offset == 0 { //zero offset causes division with 0 panics.
+			job.Offset = 1
+		}
 		jobs[rule.Id] = job
 	}