diff --git a/src/gui/editing.cpp b/src/gui/editing.cpp
index 183560191..555008efd 100644
--- a/src/gui/editing.cpp
+++ b/src/gui/editing.cpp
@@ -1665,6 +1665,10 @@ void FurnaceGUI::doExpand(int multiplier, const SelectionPoint& sStart, const Se
 
 void FurnaceGUI::doCollapseSong(int divider) {
   if (divider<2) return;
+  if (e->curSubSong->patLen<divider) {
+    showError("can't collapse any further!##sged");
+    return;
+  }
   finishSelection();
 
   UndoStep us;