diff --git a/core_lib/src/canvaspainter.cpp b/core_lib/src/canvaspainter.cpp
index 0cb9b7935..f412cdaa1 100644
--- a/core_lib/src/canvaspainter.cpp
+++ b/core_lib/src/canvaspainter.cpp
@@ -464,7 +464,8 @@ void CanvasPainter::paintTransformedSelection(QPainter& painter)
     if (layer->type() == Layer::BITMAP)
     {
         // Get the transformed image
-        BitmapImage* bitmapImage = dynamic_cast<LayerBitmap*>(layer)->getLastBitmapImageAtFrame(mFrameNumber, 0);
+        BitmapImage* bitmapImage = static_cast<LayerBitmap*>(layer)->getLastBitmapImageAtFrame(mFrameNumber, 0);
+        if (bitmapImage == nullptr) { return; };
         BitmapImage transformedImage = bitmapImage->transformed(mSelection, mSelectionTransform, mOptions.bAntiAlias);
 
         // Paint the transformation output
diff --git a/core_lib/src/interface/editor.cpp b/core_lib/src/interface/editor.cpp
index 7189f1dda..ccf78cc89 100644
--- a/core_lib/src/interface/editor.cpp
+++ b/core_lib/src/interface/editor.cpp
@@ -541,13 +541,15 @@ void Editor::copy()
     if (layer->type() == Layer::BITMAP)
     {
         LayerBitmap* layerBitmap = static_cast<LayerBitmap*>(layer);
+        BitmapImage* bitmapImage = layerBitmap->getLastBitmapImageAtFrame(currentFrame(), 0);
+        if (bitmapImage == nullptr) { return; }
         if (select()->somethingSelected())
         {
-            g_clipboardBitmapImage = layerBitmap->getLastBitmapImageAtFrame(currentFrame(), 0)->copy(select()->mySelectionRect().toRect());  // copy part of the image
+            g_clipboardBitmapImage = bitmapImage->copy(select()->mySelectionRect().toRect());  // copy part of the image
         }
         else
         {
-            g_clipboardBitmapImage = layerBitmap->getLastBitmapImageAtFrame(currentFrame(), 0)->copy();  // copy the whole image
+            g_clipboardBitmapImage = bitmapImage->copy();  // copy the whole image
         }
         clipboardBitmapOk = true;
         if (g_clipboardBitmapImage.image() != nullptr)
@@ -557,10 +559,8 @@ void Editor::copy()
     {
         clipboardVectorOk = true;
         VectorImage *vectorImage = static_cast<LayerVector*>(layer)->getLastVectorImageAtFrame(currentFrame(), 0);
-        if (vectorImage != nullptr)
-        {
-            g_clipboardVectorImage = *vectorImage;  // copy the image
-        }
+        if (vectorImage == nullptr) { return; }
+        g_clipboardVectorImage = *vectorImage;  // copy the image
     }
 }
 
@@ -589,7 +589,9 @@ void Editor::paste()
             }
             auto pLayerBitmap = static_cast<LayerBitmap*>(layer);
             mScribbleArea->handleDrawingOnEmptyFrame();
-            pLayerBitmap->getLastBitmapImageAtFrame(currentFrame(), 0)->paste(&tobePasted); // paste the clipboard
+            BitmapImage *bitmapImage = pLayerBitmap->getLastBitmapImageAtFrame(currentFrame(), 0);
+            Q_CHECK_PTR(bitmapImage);
+            bitmapImage->paste(&tobePasted); // paste the clipboard
         }
         else if (layer->type() == Layer::VECTOR && clipboardVectorOk)
         {
diff --git a/core_lib/src/interface/scribblearea.cpp b/core_lib/src/interface/scribblearea.cpp
index 7fca72154..be5a498f2 100644
--- a/core_lib/src/interface/scribblearea.cpp
+++ b/core_lib/src/interface/scribblearea.cpp
@@ -1391,6 +1391,7 @@ void ScribbleArea::applyTransformedSelection()
         {
             handleDrawingOnEmptyFrame();
             BitmapImage* bitmapImage = currentBitmapImage(layer);
+            if (bitmapImage == nullptr) { return; }
             BitmapImage transformedImage = bitmapImage->transformed(selectMan->mySelectionRect().toRect(), selectMan->selectionTransform(), true);
 
             bitmapImage->clear(selectMan->mySelectionRect());
@@ -1577,7 +1578,9 @@ void ScribbleArea::deleteSelection()
         }
         else if (layer->type() == Layer::BITMAP)
         {
-            currentBitmapImage(layer)->clear(selectMan->mySelectionRect());
+            BitmapImage* bitmapImage = currentBitmapImage(layer);
+            Q_CHECK_PTR(bitmapImage);
+            bitmapImage->clear(selectMan->mySelectionRect());
         }
         updateAllFrames();
     }
@@ -1603,7 +1606,10 @@ void ScribbleArea::clearImage()
     else if (layer->type() == Layer::BITMAP)
     {
         mEditor->backup(tr("Clear Image", "Undo step text"));
-        currentBitmapImage(layer)->clear();
+
+        BitmapImage* bitmapImage = currentBitmapImage(layer);
+        if (bitmapImage == nullptr) return;
+        bitmapImage->clear();
     }
     else
     {
diff --git a/core_lib/src/structure/object.cpp b/core_lib/src/structure/object.cpp
index 52ae492bb..761eaf409 100644
--- a/core_lib/src/structure/object.cpp
+++ b/core_lib/src/structure/object.cpp
@@ -659,8 +659,10 @@ void Object::paintImage(QPainter& painter,int frameNumber,
                 LayerBitmap* layerBitmap = static_cast<LayerBitmap*>(layer);
 
                 BitmapImage* bitmap = layerBitmap->getLastBitmapImageAtFrame(frameNumber);
-                if (bitmap)
+                if (bitmap != nullptr)
+                {
                     bitmap->paintImage(painter);
+                }
 
             }
             // paints the vector images
diff --git a/core_lib/src/tool/buckettool.cpp b/core_lib/src/tool/buckettool.cpp
index 523c848e5..bfeb3724d 100644
--- a/core_lib/src/tool/buckettool.cpp
+++ b/core_lib/src/tool/buckettool.cpp
@@ -166,7 +166,8 @@ void BucketTool::paintBitmap(Layer* layer)
     Layer* targetLayer = layer; // by default
     int layerNumber = editor()->layers()->currentLayerIndex(); // by default
 
-    BitmapImage* targetImage = ((LayerBitmap*)targetLayer)->getLastBitmapImageAtFrame(editor()->currentFrame(), 0);
+    BitmapImage* targetImage = static_cast<LayerBitmap*>(targetLayer)->getLastBitmapImageAtFrame(editor()->currentFrame(), 0);
+    if (targetImage == nullptr) { return; } // Can happen if the first frame is deleted while drawing
 
     QPoint point = QPoint(qFloor(getLastPoint().x()), qFloor(getLastPoint().y()));
     QRect cameraRect = mScribbleArea->getCameraRect().toRect();
diff --git a/core_lib/src/tool/polylinetool.cpp b/core_lib/src/tool/polylinetool.cpp
index 20e073c2c..fe1ef33d6 100644
--- a/core_lib/src/tool/polylinetool.cpp
+++ b/core_lib/src/tool/polylinetool.cpp
@@ -265,7 +265,8 @@ void PolylineTool::endPolyline(QList<QPointF> points)
     if (layer->type() == Layer::BITMAP)
     {
         drawPolyline(points, points.last());
-        BitmapImage *bitmapImage = ((LayerBitmap *)layer)->getLastBitmapImageAtFrame(mEditor->currentFrame(), 0);
+        BitmapImage *bitmapImage = static_cast<LayerBitmap*>(layer)->getLastBitmapImageAtFrame(mEditor->currentFrame(), 0);
+        if (bitmapImage == nullptr) { return; } // Can happen if the first frame is deleted while drawing
         bitmapImage->paste(mScribbleArea->mBufferImg);
     }
     mScribbleArea->setModified(mEditor->layers()->currentLayerIndex(), mEditor->currentFrame());
diff --git a/core_lib/src/tool/smudgetool.cpp b/core_lib/src/tool/smudgetool.cpp
index dcde43f08..9407ba1a6 100644
--- a/core_lib/src/tool/smudgetool.cpp
+++ b/core_lib/src/tool/smudgetool.cpp
@@ -269,9 +269,10 @@ void SmudgeTool::drawStroke()
     if (!mScribbleArea->isLayerPaintable()) return;
 
     Layer* layer = mEditor->layers()->currentLayer();
-    if (layer == NULL) { return; }
+    if (layer == nullptr) { return; }
 
-    BitmapImage *targetImage = ((LayerBitmap *)layer)->getLastBitmapImageAtFrame(mEditor->currentFrame(), 0);
+    BitmapImage *targetImage = static_cast<LayerBitmap*>(layer)->getLastBitmapImageAtFrame(mEditor->currentFrame(), 0);
+    if (targetImage == nullptr) { return; } // Can happen if the first frame is deleted while drawing
     StrokeTool::drawStroke();
     QList<QPointF> p = strokeManager()->interpolateStroke();