fix(protocol): make sure new instance is not zero address in SgxVerif…

…ier (#17918)
taikoxyz · Aug 15, 2024 · d559ce8 · d559ce8
1 parent 64ed666
commit d559ce8
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/packages/protocol/contracts/verifiers/SgxVerifier.sol b/packages/protocol/contracts/verifiers/SgxVerifier.sol
@@ -170,7 +170,7 @@ contract SgxVerifier is EssentialContract, IVerifier {
 
         if (!_isInstanceValid(id, oldInstance)) revert SGX_INVALID_INSTANCE();
 
-        if (oldInstance != newInstance) {
+        if (newInstance != oldInstance && newInstance != address(0)) {
             _replaceInstance(id, oldInstance, newInstance);
         }
     }