From 74f28bf1fdf4a22bbdf3c894132e47d01cd108ed Mon Sep 17 00:00:00 2001
From: Chris Moore <dooglus@gmail.com>
Date: Thu, 9 Feb 2012 05:21:41 -0800
Subject: [PATCH] Fix #794.  Only remove transactions from memory pool when
 they're actually in the memory pool.

---
 src/main.cpp | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index f78133b535..e4c6714eae 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -618,11 +618,15 @@ bool CTransaction::RemoveFromMemoryPool()
     // Remove transaction from memory pool
     CRITICAL_BLOCK(cs_mapTransactions)
     {
-        BOOST_FOREACH(const CTxIn& txin, vin)
-            mapNextTx.erase(txin.prevout);
-        mapTransactions.erase(GetHash());
-        nTransactionsUpdated++;
-        --nPooledTx;
+        uint256 hash = GetHash();
+        if (mapTransactions.count(hash))
+        {
+            BOOST_FOREACH(const CTxIn& txin, vin)
+                mapNextTx.erase(txin.prevout);
+            mapTransactions.erase(hash);
+            nTransactionsUpdated++;
+            --nPooledTx;
+        }
     }
     return true;
 }