diff --git a/apps/contributor/contracts/Contributor.sol b/apps/contributor/contracts/Contributor.sol
index 1c21e58..e9a6271 100644
--- a/apps/contributor/contracts/Contributor.sol
+++ b/apps/contributor/contracts/Contributor.sol
@@ -54,10 +54,13 @@ contract Contributor is AragonApp {
   }
 
   function updateContributorAccount(uint32 id, address oldAccount, address newAccount) public auth(MANAGE_CONTRIBUTORS_ROLE) {
+    require(getContributorAddressById(id) == oldAccount, "contributor does not exist");
+    
     contributorIds[oldAccount] = 0;
     contributorIds[newAccount] = id;
     contributors[id].account = newAccount;
-    ContributorAccountUpdated(id, oldAccount, newAccount);
+
+    emit ContributorAccountUpdated(id, oldAccount, newAccount);
   }
 
   function updateContributorProfileHash(uint32 id, bytes32 hashDigest, uint8 hashFunction, uint8 hashSize) public isInitialized auth(MANAGE_CONTRIBUTORS_ROLE) {