From 86a4746b6a3ca509d5238b39bbedcf407fb5072e Mon Sep 17 00:00:00 2001
From: Aranha <50056110+aranhaagency@users.noreply.github.com>
Date: Sun, 16 Feb 2020 19:13:03 -0300
Subject: [PATCH]  fixed panic: runtime error: integer divide by zero #4777
 (#4823)

---
 beacon-chain/sync/pending_attestations_queue.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/beacon-chain/sync/pending_attestations_queue.go b/beacon-chain/sync/pending_attestations_queue.go
index 2a24800d7f9..cf31b82df15 100644
--- a/beacon-chain/sync/pending_attestations_queue.go
+++ b/beacon-chain/sync/pending_attestations_queue.go
@@ -117,6 +117,9 @@ func (s *Service) processPendingAtts(ctx context.Context) error {
 
 			// Start with a random peer to query, but choose the first peer in our unsorted list that claims to
 			// have a head slot newer or equal to the pending attestation's target boundary slot.
+			if len(pids) == 0 {
+				return nil
+			}
 			pid := pids[rand.Int()%len(pids)]
 			targetSlot := helpers.SlotToEpoch(attestations[0].Aggregate.Data.Target.Epoch)
 			for _, p := range pids {