# MutantHub mutant #477: Logical operator mutation at psbt.cpp:452
# Repository: bitcoin/bitcoin @ 2f72123f613f3aa1484ed06344039be78dedcb33
# File: src/psbt.cpp:452-452
# Review: APPROVED; outcome: SURVIVED
--- a/src/psbt.cpp
+++ b/src/psbt.cpp
@@ -452,1 +452,1 @@
-    if (m_tap_merkle_root.IsNull() && !input.m_tap_merkle_root.IsNull()) m_tap_merkle_root = input.m_tap_merkle_root;
+    if (m_tap_merkle_root.IsNull() || !input.m_tap_merkle_root.IsNull()) m_tap_merkle_root = input.m_tap_merkle_root;