diff --git a/src/app/cmd/copy_cel.cpp b/src/app/cmd/copy_cel.cpp
index 395a1eccb..634de732d 100644
--- a/src/app/cmd/copy_cel.cpp
+++ b/src/app/cmd/copy_cel.cpp
@@ -1,5 +1,5 @@
 // Aseprite
-// Copyright (C) 2019  Igara Studio S.A.
+// Copyright (C) 2019-2020  Igara Studio S.A.
 // Copyright (C) 2001-2016  David Capello
 //
 // This program is distributed under the terms of
@@ -125,7 +125,11 @@ void CopyCel::onFireNotifications()
 {
   CmdSequence::onFireNotifications();
 
-  ASSERT(m_srcLayer.layer());
+  // The m_srcLayer can be nullptr now because the layer from where we
+  // copied this cel might not exist anymore (e.g. if we copied the
+  // cel from another document that is already closed)
+  //ASSERT(m_srcLayer.layer());
+
   ASSERT(m_dstLayer.layer());
 
   static_cast<Doc*>(m_dstLayer.layer()->sprite()->document())
diff --git a/src/app/doc.cpp b/src/app/doc.cpp
index db4882f3f..52eb2ff5a 100644
--- a/src/app/doc.cpp
+++ b/src/app/doc.cpp
@@ -228,7 +228,7 @@ void Doc::notifyLayerMergedDown(Layer* srcLayer, Layer* targetLayer)
 void Doc::notifyCelMoved(Layer* fromLayer, frame_t fromFrame, Layer* toLayer, frame_t toFrame)
 {
   DocEvent ev(this);
-  ev.sprite(fromLayer->sprite());
+  ev.sprite(toLayer->sprite());
   ev.layer(fromLayer);
   ev.frame(fromFrame);
   ev.targetLayer(toLayer);
@@ -239,8 +239,8 @@ void Doc::notifyCelMoved(Layer* fromLayer, frame_t fromFrame, Layer* toLayer, fr
 void Doc::notifyCelCopied(Layer* fromLayer, frame_t fromFrame, Layer* toLayer, frame_t toFrame)
 {
   DocEvent ev(this);
-  ev.sprite(fromLayer->sprite());
-  ev.layer(fromLayer);
+  ev.sprite(toLayer->sprite());
+  ev.layer(fromLayer);          // From layer can be nullptr
   ev.frame(fromFrame);
   ev.targetLayer(toLayer);
   ev.targetFrame(toFrame);