# MutantHub mutant #475: Logical operator mutation at psbt.cpp:450
# Repository: bitcoin/bitcoin @ 2f72123f613f3aa1484ed06344039be78dedcb33
# File: src/psbt.cpp:450-450
# Review: APPROVED; outcome: SURVIVED
--- a/src/psbt.cpp
+++ b/src/psbt.cpp
@@ -450,1 +450,1 @@
-    if (m_tap_key_sig.empty() && !input.m_tap_key_sig.empty()) m_tap_key_sig = input.m_tap_key_sig;
+    if (m_tap_key_sig.empty() || !input.m_tap_key_sig.empty()) m_tap_key_sig = input.m_tap_key_sig;