# MutantHub mutant #528: Logical operator mutation at psbt.cpp:717
# Repository: bitcoin/bitcoin @ 2f72123f613f3aa1484ed06344039be78dedcb33
# File: src/psbt.cpp:717-717
# Review: APPROVED; outcome: KILLED
--- a/src/psbt.cpp
+++ b/src/psbt.cpp
@@ -717,1 +717,1 @@
-        if (!input.m_tap_key_sig.empty() && (input.m_tap_key_sig.size() != 65 || input.m_tap_key_sig.back() != sighash)) {
+        if (!input.m_tap_key_sig.empty() || (input.m_tap_key_sig.size() != 65 || input.m_tap_key_sig.back() != sighash)) {