From 102c926ef3779ffab1e37cd454e3eab4e43ff98d Mon Sep 17 00:00:00 2001
From: Roman Khimov <roman@nspcc.ru>
Date: Sun, 22 Sep 2019 20:06:52 +0300
Subject: [PATCH] core: don't print useless persist messages with nil errors

Errors should be printed only when there are errors.
---
 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 4fc630860..93991ff15 100644
--- a/pkg/core/blockchain.go
+++ b/pkg/core/blockchain.go
@@ -169,7 +169,9 @@ func (bc *Blockchain) Run(ctx context.Context) {
 		case <-persistTimer.C:
 			go func() {
 				err := bc.Persist(ctx)
-				log.Warnf("failed to persist blockchain: %s", err)
+				if err != nil {
+					log.Warnf("failed to persist blockchain: %s", err)
+				}
 			}()
 			persistTimer.Reset(persistInterval)
 		}