diff --git a/contracts/contracts/KMSVerifier.sol b/contracts/contracts/KMSVerifier.sol
index bed089b..df1ec17 100644
--- a/contracts/contracts/KMSVerifier.sol
+++ b/contracts/contracts/KMSVerifier.sol
@@ -30,6 +30,9 @@ contract KMSVerifier is UUPSUpgradeable, Ownable2StepUpgradeable, EIP712Upgradea
     /// @param numSignatures Number of signatures.
     error KMSSignatureThresholdNotReached(uint256 numSignatures);
 
+    /// @notice Returned if the number of signatures is equal to 0.
+    error KMSZeroSignature();
+
     struct DecryptionResult {
         address aclAddress;
         uint256[] handlesList;
@@ -250,6 +253,11 @@ contract KMSVerifier is UUPSUpgradeable, Ownable2StepUpgradeable, EIP712Upgradea
     /// @return true if enough provided signatures are valid, false otherwise
     function verifySignaturesDigest(bytes32 digest, bytes[] memory signatures) internal virtual returns (bool) {
         uint256 numSignatures = signatures.length;
+
+        if (numSignatures == 0) {
+            revert KMSZeroSignature();
+        }
+        
         uint256 threshold = getThreshold();
 
         if (numSignatures < threshold) {