diff --git a/qad_blockview/blockview.cpp b/qad_blockview/blockview.cpp
index 7b436b7..583469e 100644
--- a/qad_blockview/blockview.cpp
+++ b/qad_blockview/blockview.cpp
@@ -810,6 +810,7 @@ QList<BlockBusItem * > BlockView::connectionBuses(BlockItem * b0, BlockItem * b1
 
 bool BlockView::connectPins(BlockItemPin * p0, BlockItemPin * p1) {
 	if (!p0 || !p1) return false;
+	if (p0 == p1) return false;
 	if (p0->busType() != p1->busType()) return false;
 	QList<BlockBusItem * > bl0 = p0->connectedBuses(), bl1 = p1->connectedBuses();
 	if (!(bl0.toSet() & bl1.toSet()).isEmpty()) return true;