# MutantHub mutant #526: Logical operator mutation at psbt.cpp:710
# Repository: bitcoin/bitcoin @ 2f72123f613f3aa1484ed06344039be78dedcb33
# File: src/psbt.cpp:710-710
# Review: APPROVED; outcome: KILLED
--- a/src/psbt.cpp
+++ b/src/psbt.cpp
@@ -710,1 +710,1 @@
-        if (!input.m_tap_key_sig.empty() && input.m_tap_key_sig.size() != 64) {
+        if (!input.m_tap_key_sig.empty() || input.m_tap_key_sig.size() != 64) {