From 663f10192f6abdb8208fc47368f01f03ebf1af9d Mon Sep 17 00:00:00 2001
From: Roman Khimov <roman@nspcc.ru>
Date: Tue, 16 Mar 2021 12:56:31 +0300
Subject: [PATCH] core: record transfers even if 'from' balance is 0

Transfer events should still be saved even if balance tracking goes wild.
---
 pkg/core/blockchain.go | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/pkg/core/blockchain.go b/pkg/core/blockchain.go
index 46d448668..07af0b03f 100644
--- a/pkg/core/blockchain.go
+++ b/pkg/core/blockchain.go
@@ -945,15 +945,14 @@ func (bc *Blockchain) processNEP5Transfer(cache *dao.Cached, transfer *state.NEP
 			return
 		}
 		bs := balances.Trackers[transfer.Asset]
-		if bs.Balance == nil {
-			return
-		}
-		bs.Balance.Sub(bs.Balance, transfer.Amount)
-		if bs.Balance.Sign() > 0 {
-			bs.LastUpdatedBlock = transfer.Block
-			balances.Trackers[transfer.Asset] = bs
-		} else {
-			delete(balances.Trackers, transfer.Asset)
+		if bs.Balance != nil {
+			bs.Balance.Sub(bs.Balance, transfer.Amount)
+			if bs.Balance.Sign() > 0 {
+				bs.LastUpdatedBlock = transfer.Block
+				balances.Trackers[transfer.Asset] = bs
+			} else {
+				delete(balances.Trackers, transfer.Asset)
+			}
 		}
 
 		transfer.Amount.Neg(transfer.Amount)