# MutantHub mutant #4217: Relational operator mutation at validation.cpp:4907
# Repository: bitcoin/bitcoin @ ddea9196493d3b8fd841a36a6c53efd85dac7a05
# File: src/validation.cpp:4907-4907
# Review: APPROVED; outcome: SURVIVED
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -4907,1 +4907,1 @@
-            if (pindexOld->nHeight > 0) { // Never disconnect the genesis block.
+            if (pindexOld->nHeight >= 0) { // Never disconnect the genesis block.