diff --git a/src/gui/insEdit.cpp b/src/gui/insEdit.cpp
index 1bc77bbf9..581251dc7 100644
--- a/src/gui/insEdit.cpp
+++ b/src/gui/insEdit.cpp
@@ -7747,7 +7747,7 @@ void FurnaceGUI::drawInsEdit() {
 }
 
 void FurnaceGUI::checkRecordInstrumentUndoStep() {
-  if (curIns>=0 && curIns<(int)e->song.ins.size()) {
+  if (insEditOpen && curIns>=0 && curIns<(int)e->song.ins.size()) {
     DivInstrument* ins=e->song.ins[curIns];
 
     // invalidate cachedCurIns/any possible changes if the cachedCurIns was referencing a different