From a2f214fc8fe0f88824948c368ca9781be55e93f8 Mon Sep 17 00:00:00 2001
From: Anna Carroll <anna.s.carroll@gmail.com>
Date: Sun, 5 May 2024 16:29:09 -0500
Subject: [PATCH] ensure sequencer is not zero address

---
 src/Zenith.sol | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Zenith.sol b/src/Zenith.sol
index 2e5af99..8ef504e 100644
--- a/src/Zenith.sol
+++ b/src/Zenith.sol
@@ -120,7 +120,7 @@ contract Zenith is Passage, AccessControlDefaultAdminRules {
         address sequencer = ecrecover(blockCommit, v, r, s);
 
         // assert that signature is valid && sequencer is permissioned
-        if (!hasRole(SEQUENCER_ROLE, sequencer)) revert BadSignature(sequencer);
+        if (sequencer == address(0) || !hasRole(SEQUENCER_ROLE, sequencer)) revert BadSignature(sequencer);
 
         // assert this is the first rollup block submitted for this host block
         if (lastSubmittedAtBlock[header.rollupChainId] == block.number) revert OneRollupBlockPerHostBlock();