diff --git a/libs/image/KisSelectionUpdateCompressor.cpp b/libs/image/KisSelectionUpdateCompressor.cpp
index 129e6d471b..91206c8f9d 100644
--- a/libs/image/KisSelectionUpdateCompressor.cpp
+++ b/libs/image/KisSelectionUpdateCompressor.cpp
@@ -1,75 +1,77 @@
 /*
  *  Copyright (c) 2018 Dmitry Kazakov <dimula73@gmail.com>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
 
 #include "KisSelectionUpdateCompressor.h"
 #include "kis_image.h"
 #include "kis_selection.h"
 #include "kis_layer_utils.h"
 #include "kis_update_selection_job.h"
 
 
 KisSelectionUpdateCompressor::KisSelectionUpdateCompressor(KisSelection *selection)
     : m_parentSelection(selection)
     , m_updateSignalCompressor(new KisThreadSafeSignalCompressor(100, KisSignalCompressor::POSTPONE))
 {
     connect(m_updateSignalCompressor, SIGNAL(timeout()), this, SLOT(startUpdateJob()));
 
     this->moveToThread(m_updateSignalCompressor->thread());
 }
 
 KisSelectionUpdateCompressor::~KisSelectionUpdateCompressor()
 {
     m_updateSignalCompressor->deleteLater();
 }
 
 void KisSelectionUpdateCompressor::requestUpdate(const QRect &updateRect)
 {
     m_fullUpdateRequested |= updateRect.isEmpty();
     m_updateRect = !m_fullUpdateRequested ? m_updateRect | updateRect : QRect();
     m_updateSignalCompressor->start();
 }
 
 void KisSelectionUpdateCompressor::tryProcessStalledUpdate()
 {
     if (m_hasStalledUpdate) {
         m_updateSignalCompressor->start();
     }
 }
 
 void KisSelectionUpdateCompressor::startUpdateJob()
 {
     KisNodeSP parentNode = m_parentSelection->parentNode();
     if (!parentNode) {
         m_hasStalledUpdate = true;
         return;
     }
 
+    // FIXME: we cannot use parentNode->image() here because masks don't
+    //        have the pointer initialized for some reason.
     KisImageSP image = KisLayerUtils::findImageByHierarchy(parentNode);
     if (!image) {
         m_hasStalledUpdate = true;
         return;
     }
 
     if (image) {
         image->addSpontaneousJob(new KisUpdateSelectionJob(m_parentSelection, m_updateRect));
     }
     m_updateRect = QRect();
     m_fullUpdateRequested = false;
     m_hasStalledUpdate = false;
 }