From 33b6fbc72795715b0dc2cdec601cf89d68f03d3a Mon Sep 17 00:00:00 2001
From: Dan Liu <liudaniel@qq.com>
Date: Thu, 17 Mar 2022 11:53:44 +0800
Subject: [PATCH] fix bug in library ExplicitERC20

---
 contracts/lib/ExplicitERC20.sol | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/contracts/lib/ExplicitERC20.sol b/contracts/lib/ExplicitERC20.sol
index 7684e1ae7..582414d5c 100644
--- a/contracts/lib/ExplicitERC20.sol
+++ b/contracts/lib/ExplicitERC20.sol
@@ -63,7 +63,7 @@ library ExplicitERC20 {
 
             // Verify transfer quantity is reflected in balance
             require(
-                newBalance == existingBalance.add(_quantity),
+                newBalance == existingBalance.add(_quantity) || _from == _to,
                 "Invalid post transfer balance"
             );
         }