From 4e097c1e80e325cfb5440586ada9f8c103f42251 Mon Sep 17 00:00:00 2001
From: Mike Hearn <hearn@google.com>
Date: Fri, 5 Aug 2011 14:09:48 +0000
Subject: [PATCH] Throw BlockStoreException if the chain head doesn't seem to
 be in the store. Update issue 66.

---
 src/com/google/bitcoin/store/BoundedOverheadBlockStore.java | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/com/google/bitcoin/store/BoundedOverheadBlockStore.java b/src/com/google/bitcoin/store/BoundedOverheadBlockStore.java
index 67d70e5c..01d69486 100644
--- a/src/com/google/bitcoin/store/BoundedOverheadBlockStore.java
+++ b/src/com/google/bitcoin/store/BoundedOverheadBlockStore.java
@@ -268,7 +268,10 @@ public class BoundedOverheadBlockStore implements BlockStore {
     }
 
     public synchronized StoredBlock getChainHead() throws BlockStoreException {
-        return get(chainHead);
+        StoredBlock head = get(chainHead);
+        if (head == null)
+            throw new BlockStoreException("Corrupted block store: chain head not found");
+        return head;
     }
 
     public synchronized void setChainHead(StoredBlock chainHead) throws BlockStoreException {