From 39767a2c7da3b22efc8d90623dcda12b6ab4f419 Mon Sep 17 00:00:00 2001
From: Forrest Voight <forrest@forre.st>
Date: Mon, 20 Jan 2014 02:58:25 -0500
Subject: [PATCH] fixed possible crash introduced by prior commit

---
 p2pool/data.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/p2pool/data.py b/p2pool/data.py
index 7c44878..e8fe347 100644
--- a/p2pool/data.py
+++ b/p2pool/data.py
@@ -430,7 +430,7 @@ class OkayTracker(forest.Tracker):
         try:
             share.check(self)
         except:
-            log.err(None, 'Share check failed: %064x -> %064x' % (share.hash, share.previous_hash))
+            log.err(None, 'Share check failed: %064x -> %064x' % (share.hash, share.previous_hash if share.previous_hash is not None else 0))
             return False
         else:
             self.verified.add(share)
-- 
1.7.1