ProcessBlock is sometimes called with pfrom==NULL

src/main.cpp

@@ -1652,6 +1652,7 @@ bool ProcessBlock(CNode* pfrom, CBlock* pblock)
         int64 deltaTime = pblock->GetBlockTime() - pcheckpoint->nTime;
         if (deltaTime < 0)
         {
+            if (pfrom)
                 pfrom->Misbehaving(100);
             return error("ProcessBlock() : block with timestamp before last checkpoint");
         }
@@ -1661,6 +1662,7 @@ bool ProcessBlock(CNode* pfrom, CBlock* pblock)
         bnRequired.SetCompact(ComputeMinWork(pcheckpoint->nBits, deltaTime));
         if (bnNewBlock > bnRequired)
         {
+            if (pfrom)
                 pfrom->Misbehaving(100);
             return error("ProcessBlock() : block with too little proof-of-work");
         }