diff --git a/.solcover.ts b/.solcover.ts
index d59dfcf..9bbbf81 100644
--- a/.solcover.ts
+++ b/.solcover.ts
@@ -1,4 +1,4 @@
 module.exports = {
-  skipFiles: [],
+  skipFiles: ["mock/"],
   configureYulOptimizer: true,
 };
diff --git a/contracts/state/ProposalsState.sol b/contracts/state/ProposalsState.sol
index 0940465..3d0f185 100644
--- a/contracts/state/ProposalsState.sol
+++ b/contracts/state/ProposalsState.sol
@@ -75,7 +75,7 @@ contract ProposalsState is OwnableUpgradeable, TSSUpgradeable {
     event ProposalCreated(uint256 indexed proposalId, address proposalSMT);
     event ProposalConfigChanged(uint256 indexed proposalId);
     event ProposalHidden(uint256 indexed proposalId, bool hide);
-    event VoteCast(uint256 indexed proposalId, uint256 userNullifier, uint256[] vote);
+    event VoteCast(uint256 indexed proposalId, uint256 indexed userNullifier, uint256[] vote);
 
     modifier onlyVoting() {
         _onlyVoting();