diff --git a/yarn-project/sequencer-client/src/sequencer/sequencer.test.ts b/yarn-project/sequencer-client/src/sequencer/sequencer.test.ts
index cd3debc369ef..f3c0a67cfcb4 100644
--- a/yarn-project/sequencer-client/src/sequencer/sequencer.test.ts
+++ b/yarn-project/sequencer-client/src/sequencer/sequencer.test.ts
@@ -491,6 +491,18 @@ describe('sequencer', () => {
     expect(publisher.proposeL2Block).not.toHaveBeenCalled();
   });
 
+  it('does not publish a block if the block proposal failed', async () => {
+    const tx = makeTx();
+    mockPendingTxs([tx]);
+    block = await makeBlock([tx]);
+
+    validatorClient.createBlockProposal.mockResolvedValue(undefined);
+
+    await sequencer.doRealWork();
+
+    expect(publisher.proposeL2Block).not.toHaveBeenCalled();
+  });
+
   describe('proof quotes', () => {
     let tx: Tx;
     let txHash: TxHash;
@@ -587,6 +599,25 @@ describe('sequencer', () => {
       expect(publisher.proposeL2Block).not.toHaveBeenCalled();
     });
 
+    it('submits a valid proof quote if building a block proposal fails', async () => {
+      const blockNumber = epochDuration + 1;
+      await setupForBlockNumber(blockNumber);
+
+      const proofQuote = mockEpochProofQuote();
+
+      p2p.getEpochProofQuotes.mockResolvedValue([proofQuote]);
+      publisher.validateProofQuote.mockImplementation((x: EpochProofQuote) => Promise.resolve(x));
+
+      // The previous epoch can be claimed
+      publisher.getClaimableEpoch.mockImplementation(() => Promise.resolve(currentEpoch - 1n));
+
+      validatorClient.createBlockProposal.mockResolvedValue(undefined);
+
+      await sequencer.doRealWork();
+      expect(publisher.claimEpochProofRight).toHaveBeenCalledWith(proofQuote);
+      expect(publisher.proposeL2Block).not.toHaveBeenCalled();
+    });
+
     it('does not claim the epoch previous to the first', async () => {
       const blockNumber = 1;
       await setupForBlockNumber(blockNumber);
diff --git a/yarn-project/sequencer-client/src/sequencer/sequencer.ts b/yarn-project/sequencer-client/src/sequencer/sequencer.ts
index 6388bf22086e..d1300a73f44a 100644
--- a/yarn-project/sequencer-client/src/sequencer/sequencer.ts
+++ b/yarn-project/sequencer-client/src/sequencer/sequencer.ts
@@ -300,6 +300,9 @@ export class Sequencer {
       await this.buildBlockAndAttemptToPublish(pendingTxs, proposalHeader);
     } catch (err) {
       this.log.error(`Error assembling block`, err, { blockNumber: newBlockNumber, slot });
+
+      // If the block failed to build, we might still want to claim the proving rights
+      await this.claimEpochProofRightIfAvailable(slot);
     }
     this.setState(SequencerState.IDLE, 0n);
   }
@@ -627,8 +630,8 @@ export class Sequencer {
     this.log.debug('Creating block proposal for validators');
     const proposal = await this.validatorClient.createBlockProposal(block.header, block.archive.root, txHashes);
     if (!proposal) {
-      this.log.warn(`Failed to create block proposal, skipping collecting attestations`);
-      return undefined;
+      const msg = `Failed to create block proposal`;
+      throw new Error(msg);
     }
 
     this.log.debug('Broadcasting block proposal to validators');
diff --git a/yarn-project/simulator/src/public/public_processor.ts b/yarn-project/simulator/src/public/public_processor.ts
index b3c1194c27ba..f95595699ac8 100644
--- a/yarn-project/simulator/src/public/public_processor.ts
+++ b/yarn-project/simulator/src/public/public_processor.ts
@@ -280,7 +280,7 @@ export class PublicProcessor implements Traceable {
     const rate = duration > 0 ? totalPublicGas.l2Gas / duration : 0;
     this.metrics.recordAllTxs(totalPublicGas, rate);
 
-    this.log.info(`Processed ${result.length} succesful txs and ${failed.length} txs in ${duration}ms`, {
+    this.log.info(`Processed ${result.length} successful txs and ${failed.length} txs in ${duration}s`, {
       duration,
       rate,
       totalPublicGas,