From 92def54680eb8b7cb03227f410168fd37626d931 Mon Sep 17 00:00:00 2001
From: arya2 <aryasolhi@gmail.com>
Date: Wed, 18 Oct 2023 14:41:32 -0400
Subject: [PATCH] avoids panic when checkpoints are missing

---
 zebra-state/src/service.rs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/zebra-state/src/service.rs b/zebra-state/src/service.rs
index f36cb488ec2..7ec6ce07180 100644
--- a/zebra-state/src/service.rs
+++ b/zebra-state/src/service.rs
@@ -389,8 +389,7 @@ impl StateService {
         let full_verifier_utxo_lookahead = max_checkpoint_height
             - HeightDiff::try_from(checkpoint_verify_concurrency_limit)
                 .expect("fits in HeightDiff");
-        let full_verifier_utxo_lookahead =
-            full_verifier_utxo_lookahead.expect("unexpected negative height");
+        let full_verifier_utxo_lookahead = full_verifier_utxo_lookahead.unwrap_or(block::Height(0));
 
         let non_finalized_state_queued_blocks = QueuedBlocks::default();
         let pending_utxos = PendingUtxos::default();