diff --git a/src/validation.cpp b/src/validation.cpp
index bfa560c463deb..804b748878f06 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -2222,13 +2222,40 @@ static bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockInd
                      pindex->GetBlockHash().ToString(), FormatStateMessage(state));
     }
 
-    // DASH : MODIFIED TO CHECK MASTERNODE PAYMENTS AND SUPERBLOCKS
+    // DASH
 
     // It's possible that we simply don't have enough data and this could fail
     // (i.e. block itself could be a correct one and we need to store it),
     // that's why this is in ConnectBlock. Could be the other way around however -
     // the peer who sent us this block is missing some data and wasn't able
     // to recognize that block is actually invalid.
+
+    // DASH : CHECK TRANSACTIONS FOR INSTANTSEND
+
+    if (sporkManager.IsSporkActive(SPORK_3_INSTANTSEND_BLOCK_FILTERING)) {
+        // Require other nodes to comply, send them some data in case they are missing it.
+        for (const auto& tx : block.vtx) {
+            // skip txes that have no inputs
+            if (tx->vin.empty()) continue;
+            // LOOK FOR TRANSACTION LOCK IN OUR MAP OF OUTPOINTS
+            for (const auto& txin : tx->vin) {
+                uint256 hashLocked;
+                if (instantsend.GetLockedOutPointTxHash(txin.prevout, hashLocked) && hashLocked != tx->GetHash()) {
+                    // The node which relayed this should switch to correct chain.
+                    // TODO: relay instantsend data/proof.
+                    LOCK(cs_main);
+                    mapRejectedBlocks.insert(std::make_pair(block.GetHash(), GetTime()));
+                    return state.DoS(10, error("ConnectBlock(DASH): transaction %s conflicts with transaction lock %s", tx->GetHash().ToString(), hashLocked.ToString()),
+                                     REJECT_INVALID, "conflict-tx-lock");
+                }
+            }
+        }
+    } else {
+        LogPrintf("ConnectBlock(DASH): spork is off, skipping transaction locking checks\n");
+    }
+
+    // DASH : MODIFIED TO CHECK MASTERNODE PAYMENTS AND SUPERBLOCKS
+
     // TODO: resync data (both ways?) and try to reprocess this block later.
     CAmount blockReward = nFees + GetBlockSubsidy(pindex->pprev->nBits, pindex->pprev->nHeight, chainparams.GetConsensus());
     std::string strError = "";
@@ -3271,35 +3298,6 @@ bool CheckBlock(const CBlock& block, CValidationState& state, const Consensus::P
         if (block.vtx[i]->IsCoinBase())
             return state.DoS(100, false, REJECT_INVALID, "bad-cb-multiple", false, "more than one coinbase");
 
-
-    // DASH : CHECK TRANSACTIONS FOR INSTANTSEND
-
-    if(sporkManager.IsSporkActive(SPORK_3_INSTANTSEND_BLOCK_FILTERING)) {
-        // We should never accept block which conflicts with completed transaction lock,
-        // that's why this is in CheckBlock unlike coinbase payee/amount.
-        // Require other nodes to comply, send them some data in case they are missing it.
-        for(const auto& tx : block.vtx) {
-            // skip coinbase, it has no inputs
-            if (tx->IsCoinBase()) continue;
-            // LOOK FOR TRANSACTION LOCK IN OUR MAP OF OUTPOINTS
-            for (const auto& txin : tx->vin) {
-                uint256 hashLocked;
-                if(instantsend.GetLockedOutPointTxHash(txin.prevout, hashLocked) && hashLocked != tx->GetHash()) {
-                    // The node which relayed this will have to switch later,
-                    // relaying instantsend data won't help it.
-                    LOCK(cs_main);
-                    mapRejectedBlocks.insert(std::make_pair(block.GetHash(), GetTime()));
-                    return state.DoS(100, false, REJECT_INVALID, "conflict-tx-lock", false, 
-                                     strprintf("transaction %s conflicts with transaction lock %s", tx->GetHash().ToString(), hashLocked.ToString()));
-                }
-            }
-        }
-    } else {
-        LogPrintf("CheckBlock(DASH): spork is off, skipping transaction locking checks\n");
-    }
-
-    // END DASH
-
     // Check transactions
     for (const auto& tx : block.vtx)
         if (!CheckTransaction(*tx, state))