From 1d12e7a8b7fe389766b92968a513e84fc0170435 Mon Sep 17 00:00:00 2001
From: JoelKatz <DavidJoelSchwartz@GMail.com>
Date: Fri, 8 Feb 2013 22:11:07 -0800
Subject: [PATCH] Don't crash if a node is deleted.

---
 src/cpp/ripple/OrderBookDB.cpp | 25 ++++++++++++++-----------
 1 file changed, 14 insertions(+), 11 deletions(-)

diff --git a/src/cpp/ripple/OrderBookDB.cpp b/src/cpp/ripple/OrderBookDB.cpp
index 101cf3c3ad..93da712b76 100644
--- a/src/cpp/ripple/OrderBookDB.cpp
+++ b/src/cpp/ripple/OrderBookDB.cpp
@@ -182,20 +182,23 @@ void OrderBookDB::processTxn(const SerializedTransaction& stTxn, TER terResult,T
 						field=&sfNewFields;
 					}
 
-					const STObject* previous = dynamic_cast<const STObject*>(node.peekAtPField(*field));
-					if(previous)
+					if (field)
 					{
-						STAmount takerGets = previous->getFieldAmount(sfTakerGets);
-						uint160 currencyOut=takerGets.getCurrency();
-						uint160 issuerOut=takerGets.getIssuer();
+						const STObject* previous = dynamic_cast<const STObject*>(node.peekAtPField(*field));
+						if(previous)
+						{
+							STAmount takerGets = previous->getFieldAmount(sfTakerGets);
+							uint160 currencyOut=takerGets.getCurrency();
+							uint160 issuerOut=takerGets.getIssuer();
 
-						STAmount takerPays = previous->getFieldAmount(sfTakerPays);
-						uint160 currencyIn=takerPays.getCurrency();
-						uint160 issuerIn=takerPays.getIssuer();
+							STAmount takerPays = previous->getFieldAmount(sfTakerPays);
+							uint160 currencyIn=takerPays.getCurrency();
+							uint160 issuerIn=takerPays.getIssuer();
 
-						// determine the OrderBook
-						BookListeners::pointer book=getBookListeners(currencyIn,currencyOut,issuerIn,issuerOut);
-						if(book) book->publish(jvObj);
+							// determine the OrderBook
+							BookListeners::pointer book=getBookListeners(currencyIn,currencyOut,issuerIn,issuerOut);
+							if(book) book->publish(jvObj);
+						}
 					}
 				}
 			}catch(...)