diff --git a/src/add-ons/decorators/SATDecorator/Stacking.cpp b/src/add-ons/decorators/SATDecorator/Stacking.cpp
index 56bbf167f5..d0ee4ed6c5 100644
--- a/src/add-ons/decorators/SATDecorator/Stacking.cpp
+++ b/src/add-ons/decorators/SATDecorator/Stacking.cpp
@@ -227,6 +227,9 @@ SATStacking::FindSnappingCandidates(SATGroup* group)
 	BPoint mousePosition;
 	int32 buttons;
 	fSATWindow->GetDesktop()->GetLastMouseState(&mousePosition, &buttons);
+	if (!window->Decorator()->TabRect().Contains(mousePosition))
+		return false;
+
 	// use the upper edge of the candidate window to find the parent window
 	mousePosition.y = window->Decorator()->TabRect().top;