Fixed rasterize crashing

src/PixiEditor.ChangeableDocument/Changeables/Graph/Nodes/VectorLayerNode.cs

@@ -188,8 +188,8 @@ public class VectorLayerNode : LayerNode, ITransformableObject, IReadOnlyVectorN
     {
         int layer;
         // TODO: This can be further optimized by passing opacity, blend mode and filters directly to the rasterization method
-        if (paint.Color.A < 255 || paint.ColorFilter != null || paint.ImageFilter != null || paint.Shader != null ||
-            paint.BlendMode != Drawie.Backend.Core.Surfaces.BlendMode.SrcOver)
+        if (paint != null && (paint.Color.A < 255 || paint.ColorFilter != null || paint.ImageFilter != null || paint.Shader != null ||
+            paint.BlendMode != Drawie.Backend.Core.Surfaces.BlendMode.SrcOver))
         {
             layer = surface.Canvas.SaveLayer(paint);
         }