From 8da632f8f2902a0095bc1fcd6e1a1008950c7002 Mon Sep 17 00:00:00 2001
From: Noah Citron <noah@jeff.org>
Date: Sun, 12 Feb 2023 14:57:24 -0500
Subject: [PATCH] fix: filter invalid checkpoints from fallback (#196)

* fix: filter invalid checkpoints from fallback

* use iter find
---
 config/src/checkpoints.rs | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/config/src/checkpoints.rs b/config/src/checkpoints.rs
index 210838a..020641b 100644
--- a/config/src/checkpoints.rs
+++ b/config/src/checkpoints.rs
@@ -143,7 +143,15 @@ impl CheckpointFallback {
                         if raw.data.slots.is_empty() {
                             return Err(eyre::eyre!("no slots"));
                         }
-                        Ok(raw.data.slots[0].clone())
+
+                        let slot = raw
+                            .data
+                            .slots
+                            .iter()
+                            .find(|s| s.block_root.is_some())
+                            .ok_or(eyre::eyre!("no valid slots"))?;
+
+                        Ok(slot.clone())
                     }
                     None => Err(eyre::eyre!("failed to query service")),
                 }