From fa3e5b0c0fdd2aa297b104cd0f350519cafa892b Mon Sep 17 00:00:00 2001
From: Mubaris NK <mubaris@instadapp.io>
Date: Sun, 28 Mar 2021 00:01:18 +0530
Subject: [PATCH] Minor change

---
 contracts/TokenDelegator.sol | 1 +
 1 file changed, 1 insertion(+)

diff --git a/contracts/TokenDelegator.sol b/contracts/TokenDelegator.sol
index 7618e91..5efad45 100644
--- a/contracts/TokenDelegator.sol
+++ b/contracts/TokenDelegator.sol
@@ -12,6 +12,7 @@ contract TokenDelegator is TokenDelegatorStorage, TokenEvents {
         uint changeImplementationAfter_,
         bool transferPaused_
     ) {
+        require(implementation_ != address(0), "TokenDelegator::constructor invalid address");
         delegateTo(
             implementation_,
             abi.encodeWithSignature(