# MutantHub mutant #4010: Logical operator mutation at validation.cpp:1964
# Repository: bitcoin/bitcoin @ ddea9196493d3b8fd841a36a6c53efd85dac7a05
# File: src/validation.cpp:1964-1964
# Review: APPROVED; outcome: SURVIVED
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -1964,1 +1964,1 @@
-    if (m_chainman.m_best_header != nullptr && m_chainman.m_best_header->GetAncestor(pindexNew->nHeight) == pindexNew) {
+    if (m_chainman.m_best_header != nullptr || m_chainman.m_best_header->GetAncestor(pindexNew->nHeight) == pindexNew) {