From e1a77ab15f9e311edffe855cf5f5a2f078cdd1ea Mon Sep 17 00:00:00 2001
From: Hadrien Croubois <hadrien.croubois@gmail.com>
Date: Wed, 1 Mar 2023 19:35:15 +0100
Subject: [PATCH] Fix an upgrade replay bug in Governor.propose (#4082)

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

diff --git a/contracts/governance/Governor.sol b/contracts/governance/Governor.sol
index 1483da6d2..12fde79de 100644
--- a/contracts/governance/Governor.sol
+++ b/contracts/governance/Governor.sol
@@ -276,7 +276,7 @@ abstract contract Governor is Context, ERC165, EIP712, IGovernor, IERC721Receive
         require(targets.length == values.length, "Governor: invalid proposal length");
         require(targets.length == calldatas.length, "Governor: invalid proposal length");
         require(targets.length > 0, "Governor: empty proposal");
-        require(_proposals[proposalId].proposer == address(0), "Governor: proposal already exists");
+        require(_proposals[proposalId].voteStart == 0, "Governor: proposal already exists");
 
         uint256 snapshot = currentTimepoint + votingDelay();
         uint256 deadline = snapshot + votingPeriod();