From 357b675090b23c832965f206e6e6c82c9943d97c Mon Sep 17 00:00:00 2001
From: Roman Khimov <roman@nspcc.ru>
Date: Wed, 12 Feb 2020 20:29:10 +0300
Subject: [PATCH] core: don't choose duplicating standby validators

We may already have chosen some of standby validators, so don't repeat.
---
 pkg/core/blockchain.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pkg/core/blockchain.go b/pkg/core/blockchain.go
index 8110c37cf..33f0c81bc 100644
--- a/pkg/core/blockchain.go
+++ b/pkg/core/blockchain.go
@@ -1379,7 +1379,9 @@ func (bc *Blockchain) GetValidators(txes ...*transaction.Transaction) ([]*keys.P
 
 	result := pubKeys.Unique()
 	for i := 0; i < uniqueSBValidators.Len() && result.Len() < count; i++ {
-		result = append(result, uniqueSBValidators[i])
+		if !result.Contains(uniqueSBValidators[i]) {
+			result = append(result, uniqueSBValidators[i])
+		}
 	}
 	return result, nil
 }