From 38bb234ebc0802d8889c5ac29e7f90a3b625279f Mon Sep 17 00:00:00 2001
From: Rongjian Lan <rongjian.lan@gmail.com>
Date: Thu, 25 Feb 2021 15:49:14 -0800
Subject: [PATCH] Reuse old shard state if no validator is elected

---
 shard/committee/assignment.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/shard/committee/assignment.go b/shard/committee/assignment.go
index b9507f0d2..f0b6dabb4 100644
--- a/shard/committee/assignment.go
+++ b/shard/committee/assignment.go
@@ -350,6 +350,10 @@ func eposStakedCommittee(
 		)
 	}
 
+	if len(completedEPoSRound.AuctionWinners) == 0 {
+		utils.Logger().Warn().Msg("No elected validators in the new epoch!!! Reuse old shard state.")
+		return stakerReader.ReadShardState(big.NewInt(0).Sub(epoch, big.NewInt(1)))
+	}
 	return shardState, nil
 }