diff --git a/contracts/src/BeefyClient.sol b/contracts/src/BeefyClient.sol
index 72cd3f0fd2..bf40943a1a 100644
--- a/contracts/src/BeefyClient.sol
+++ b/contracts/src/BeefyClient.sol
@@ -299,6 +299,10 @@ contract BeefyClient {
         bytes32 ticketID = createTicketID(msg.sender, commitmentHash);
         Ticket storage ticket = tickets[ticketID];
 
+        if (ticket.blockNumber == 0) {
+            revert InvalidTicket();
+        }
+
         if (ticket.prevRandao != 0) {
             revert PrevRandaoAlreadyCaptured();
         }
diff --git a/contracts/test/BeefyClient.t.sol b/contracts/test/BeefyClient.t.sol
index eeb039ee28..8f74d10607 100644
--- a/contracts/test/BeefyClient.t.sol
+++ b/contracts/test/BeefyClient.t.sol
@@ -437,6 +437,11 @@ contract BeefyClientTest is Test {
         assertEq(beefyClient.getValidatorCounter(true, finalValidatorProofs[1].index), 0);
     }
 
+    function testCommitPrevRandaoCalledInSequence() public {
+        vm.expectRevert(BeefyClient.InvalidTicket.selector);
+        commitPrevRandao();
+    }
+
     function testSubmitWithHandoverAnd3SignatureCount() public {
         //initialize with previous set
         BeefyClient.Commitment memory commitment = initialize(setId - 1);