fix[OA-audit-N09]: Missing check for non-zero address (#4336)

Co-authored-by: Pablo Maldonado <pablo@umaproject.org>
UMAprotocol · Dec 22, 2022 · 9543282 · 9543282
1 parent 1d416c9
commit 9543282
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/packages/core/contracts/optimistic-asserter/implementation/OptimisticAsserter.sol b/packages/core/contracts/optimistic-asserter/implementation/OptimisticAsserter.sol
@@ -446,8 +446,9 @@ contract OptimisticAsserter is OptimisticAsserterInterface, Lockable, Ownable, M
     }
 
     function _isDisputeAllowed(bytes32 assertionId) internal view returns (bool) {
-        address em = assertions[assertionId].escalationManagerSettings.escalationManager;
         if (!assertions[assertionId].escalationManagerSettings.validateDisputers) return true;
+        address em = assertions[assertionId].escalationManagerSettings.escalationManager;
+        if (em == address(0)) return true;
         return EscalationManagerInterface(em).isDisputeAllowed(assertionId, msg.sender);
     }