diff --git a/src/main.cpp b/src/main.cpp
index 45f4935e447..c4d61948577 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2133,11 +2133,11 @@ bool AddToBlockIndex(CBlock& block, CValidationState& state, const CDiskBlockPos
 
     // Construct new block index object
     CBlockIndex* pindexNew = new CBlockIndex(block);
+    assert(pindexNew);
     {
          LOCK(cs_nBlockSequenceId);
          pindexNew->nSequenceId = nBlockSequenceId++;
     }
-    assert(pindexNew);
     map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.insert(make_pair(hash, pindexNew)).first;
     pindexNew->phashBlock = &((*mi).first);
     map<uint256, CBlockIndex*>::iterator miPrev = mapBlockIndex.find(block.hashPrevBlock);