# MutantHub mutant #556: Relational operator mutation at psbt.cpp:889
# Repository: bitcoin/bitcoin @ 2f72123f613f3aa1484ed06344039be78dedcb33
# File: src/psbt.cpp:889-889
# Review: APPROVED; outcome: KILLED
--- a/src/psbt.cpp
+++ b/src/psbt.cpp
@@ -889,1 +889,1 @@
-    if (m_version != std::nullopt) {
+    if (m_version == std::nullopt) {