diff --git a/src/validation.cpp b/src/validation.cpp
index 90d273c24c08a7..4d2485e13eef11 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -3074,7 +3074,7 @@ bool ResetBlockFailureFlags(CBlockIndex *pindex) {
     return true;
 }
 
-CBlockIndex* AddToBlockIndex(const CBlockHeader& block)
+CBlockIndex* AddToBlockIndex(const CBlockHeader& block, bool fValid = true)
 {
     // Check for duplicate
     uint256 hash = block.GetHash();
@@ -3100,9 +3100,13 @@ CBlockIndex* AddToBlockIndex(const CBlockHeader& block)
     }
     pindexNew->nTimeMax = (pindexNew->pprev ? std::max(pindexNew->pprev->nTimeMax, pindexNew->nTime) : pindexNew->nTime);
     pindexNew->nChainWork = (pindexNew->pprev ? pindexNew->pprev->nChainWork : 0) + GetBlockProof(*pindexNew);
-    pindexNew->RaiseValidity(BLOCK_VALID_TREE);
-    if (pindexBestHeader == NULL || pindexBestHeader->nChainWork < pindexNew->nChainWork)
-        pindexBestHeader = pindexNew;
+    if (fValid) {
+        pindexNew->RaiseValidity(BLOCK_VALID_TREE);
+        if (pindexBestHeader == NULL || pindexBestHeader->nChainWork < pindexNew->nChainWork)
+            pindexBestHeader = pindexNew;
+        } else {
+        pindexNew->nStatus |= BLOCK_FAILED_VALID;
+    }
 
     setDirtyBlockIndex.insert(pindexNew);
 
@@ -3479,6 +3483,10 @@ static bool AcceptBlockHeader(const CBlockHeader& block, CValidationState& state
             return error("%s: Consensus::ContextualCheckBlockHeader: %s, %s", __func__, hash.ToString(), FormatStateMessage(state));
 
         if (llmq::chainLocksHandler->HasConflictingChainLock(pindexPrev->nHeight + 1, hash)) {
+            if (pindex == NULL) {
+                // add it to the block index but also mark it as invalid immediately
+                AddToBlockIndex(block, false);
+            }
             return state.DoS(10, error("%s: header %s conflicts with chainlock", __func__, hash.ToString()), REJECT_INVALID, "bad-chainlock");
         }
     }