diff --git a/Canvas.cpp b/Canvas.cpp
index 4dab3f9..3528924 100644
--- a/Canvas.cpp
+++ b/Canvas.cpp
@@ -53,7 +53,7 @@ bool Canvas::areCoincident(Point* p1, Point* p2)
 		bool isSamePair = (pair_tag_0 == tag_0 && pair_tag_1 == tag_1) ||
 			(pair_tag_0 == tag_1 && pair_tag_1 == tag_0);
 
-		if (isSamePair) return true;
+		if (isSamePair && *p1 == *p2) return true;
 	}
 	return false;
 }
@@ -228,7 +228,7 @@ void Canvas::mousePressEvent(QMouseEvent* event)
 		}
 
 		if (l1 == l2 && l1 && l2 ||
-			(areCoincident(firstPoint, clickedPoint, true))) 
+			(areCoincident(firstPoint, clickedPoint))) 
 		{
 			QMessageBox::warning(this, QString("NO!"), QString("P2P failed"));
 			firstPoint = nullptr;
@@ -251,7 +251,7 @@ void Canvas::mouseMoveEvent(QMouseEvent* event)
 	if (draggedPoint) {
 		QPointF pos = event->pos() - dragOffset;
 		for (Point* pair : points) {
-			if (areCoincident(draggedPoint, pair, true)) {
+			if (areCoincident(draggedPoint, pair)) {
 				*pair->x = pos.x();
 				*pair->y = pos.y();
 			}