diff --git a/GUI/View/Scene/MaskGraphicsScene.cpp b/GUI/View/Scene/MaskGraphicsScene.cpp
index 084fafbb901259f963a7681be479e7fdbff77aec..d57897b93bf107876ee1f34239d0feb0e1585161 100644
--- a/GUI/View/Scene/MaskGraphicsScene.cpp
+++ b/GUI/View/Scene/MaskGraphicsScene.cpp
@@ -206,7 +206,8 @@ void MaskGraphicsScene::mouseReleaseEvent(QGraphicsSceneMouseEvent* event)
 
 void MaskGraphicsScene::drawForeground(QPainter* painter, const QRectF&)
 {
-    ASSERT(m_plot);
+    if (!m_plot)
+	return;
     if (m_mouse_position == QPointF())
         return;