From 74cdfc2213f0f5d44d862b66418aef18c07b22c8 Mon Sep 17 00:00:00 2001
From: Tyera Eulberg <teulberg@gmail.com>
Date: Wed, 5 Aug 2020 16:08:20 -0600
Subject: [PATCH] Fall back to root if highest_confirmed_slot bank does not
 exist (#11390)

---
 core/src/rpc.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/core/src/rpc.rs b/core/src/rpc.rs
index 7cd3d93952..ef61743572 100644
--- a/core/src/rpc.rs
+++ b/core/src/rpc.rs
@@ -121,7 +121,10 @@ impl JsonRpcRequestProcessor {
                     .unwrap()
                     .highest_confirmed_slot();
                 debug!("RPC using confirmed slot: {:?}", slot);
-                Ok(r_bank_forks.get(slot).cloned().unwrap())
+                Ok(r_bank_forks
+                    .get(slot)
+                    .cloned()
+                    .unwrap_or_else(|| r_bank_forks.root_bank().clone()))
             }
             CommitmentLevel::Max => {
                 let cluster_root = self