diff --git a/src/test/identity-manager/WorldIDIdentityManagerIdentityRegistration4844.t.sol b/src/test/identity-manager/WorldIDIdentityManagerIdentityRegistration4844.t.sol
index 5732e35..33d0ce1 100644
--- a/src/test/identity-manager/WorldIDIdentityManagerIdentityRegistration4844.t.sol
+++ b/src/test/identity-manager/WorldIDIdentityManagerIdentityRegistration4844.t.sol
@@ -370,4 +370,56 @@ contract WorldIDIdentityManagerIdentityRegistration4844 is WorldIDIdentityManage
         // Test
         assertCallFailsOn(identityManagerAddress, registerCallData, expectedError);
     }
+
+    /// @notice Checks that it reverts if the provided set of identities is incorrect.
+    function testCannotRegisterIdentitiesIfIdentitiesIncorrect(uint256 identity) public {
+        // Setup
+        uint256 invalidSlot = rotateSlot();
+        vm.assume(
+            identity != identityCommitments[invalidSlot] && identity < SNARK_SCALAR_FIELD
+            && identity != 0x0
+        );
+        uint256[] memory identities = cloneArray(identityCommitments);
+        identities[invalidSlot] = identity;
+        ITreeVerifier actualVerifier = new TreeVerifier();
+        (
+            VerifierLookupTable insertVerifiers,
+            VerifierLookupTable deletionVerifiers,
+            VerifierLookupTable updateVerifiers
+        ) = makeVerifierLookupTables(TC.makeDynArray([70]));
+        insertVerifiers.addVerifier(identityCommitmentsSize, actualVerifier);
+        makeNewIdentityManager(
+            treeDepth,
+            insertionPreRoot,
+            insertVerifiers,
+            deletionVerifiers,
+            updateVerifiers,
+            semaphoreVerifier
+        );
+
+        ManagerImplV3.RegisterIdentities4844Params memory params = ManagerImplV3.RegisterIdentities4844Params({
+            insertionProof: insertionProof,
+            commitments: commitments,
+            commitmentPok: commitmentsPok,
+            kzgCommitment: kzgCommitment,
+            kzgProof: kzgProof,
+            expectedEvaluation: insertionExpectedEvaluation,
+            preRoot: insertionPreRoot,
+            postRoot: insertionPostRoot,
+            kzgChallenge: kzgChallenge,
+            inputHash: insertionInputHash4844,
+            batchSize: uint32(identities.length),
+            startIndex: startIndex
+        });
+
+        // Mock blobhash. This is valid for the next call only.
+        prepareBlobhash(kzgToVersionedHash(kzgCommitment));
+        bytes memory registerCallData = abi.encodeCall(ManagerImplV3.registerIdentities, params);
+
+        bytes memory expectedError =
+                            abi.encodeWithSelector(ManagerImplV1.ProofValidationFailure.selector);
+
+        // Test
+        assertCallFailsOn(identityManagerAddress, registerCallData, expectedError);
+    }
 }