From d6301a6d13a9613e519ee7c64649d6d19de74563 Mon Sep 17 00:00:00 2001
From: Arya <aryasolhi@gmail.com>
Date: Mon, 23 Sep 2024 09:22:14 -0400
Subject: [PATCH] Returns an error instead of panicking when the relevant chain
 is empty (#8883)

---
 zebra-state/src/service/check.rs | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/zebra-state/src/service/check.rs b/zebra-state/src/service/check.rs
index b20ca0fd4c5..ced63bfea16 100644
--- a/zebra-state/src/service/check.rs
+++ b/zebra-state/src/service/check.rs
@@ -67,9 +67,16 @@ where
         .take(POW_ADJUSTMENT_BLOCK_SPAN)
         .collect();
 
-    let parent_block = relevant_chain
-        .first()
-        .expect("state must contain parent block to do contextual validation");
+    let Some(parent_block) = relevant_chain.first() else {
+        warn!(
+            ?semantically_verified,
+            ?finalized_tip_height,
+            "state must contain parent block to do contextual validation"
+        );
+
+        return Err(ValidateContextError::NotReadyToBeCommitted);
+    };
+
     let parent_block = parent_block.borrow();
     let parent_height = parent_block
         .coinbase_height()