Do not accept orphan blocks in -loadblock mode

src/main.cpp

@@ -1920,17 +1920,20 @@ bool ProcessBlock(CNode* pfrom, CBlock* pblock)
     }
 
 
-    // If don't already have its previous block, shunt it off to holding area until we get it
+    // If we don't already have its previous block, shunt it off to holding area until we get it
     if (!mapBlockIndex.count(pblock->hashPrevBlock))
     {
         printf("ProcessBlock: ORPHAN BLOCK, prev=%s\n", pblock->hashPrevBlock.ToString().substr(0,20).c_str());
-        CBlock* pblock2 = new CBlock(*pblock);
-        mapOrphanBlocks.insert(make_pair(hash, pblock2));
-        mapOrphanBlocksByPrev.insert(make_pair(pblock2->hashPrevBlock, pblock2));
 
-        // Ask this guy to fill in what we're missing
-        if (pfrom)
+        // Accept orphans as long as there is a node to request its parents from
+        if (pfrom) {
+            CBlock* pblock2 = new CBlock(*pblock);
+            mapOrphanBlocks.insert(make_pair(hash, pblock2));
+            mapOrphanBlocksByPrev.insert(make_pair(pblock2->hashPrevBlock, pblock2));
+
+            // Ask this guy to fill in what we're missing
             pfrom->PushGetBlocks(pindexBest, GetOrphanRoot(pblock2));
+        }
         return true;
     }