Update GridDrawNode.cs

src/Core2D/Modules/Renderer/Avalonia/Nodes/GridDrawNode.cs

@@ -60,14 +60,23 @@ internal class GridDrawNode : DrawNode, IGridDrawNode
             thickness /= zoom;
         }
 
+        // ReSharper disable once CompareOfFloatsByEqualityOperator
         if (scale != 1.0)
         {
             thickness /= scale;
         }
 
+        // ReSharper disable once CompareOfFloatsByEqualityOperator
         if (Stroke is { } && Stroke.Thickness != thickness)
         {
-            Stroke = AvaloniaDrawUtil.ToPen(Grid.GridStrokeColor, thickness);
+            if (Grid.GridStrokeColor is { })
+            {
+                Stroke = AvaloniaDrawUtil.ToPen(Grid.GridStrokeColor, thickness);
+            }
+            else
+            {
+                Stroke = null;
+            }
         }
 
         OnDraw(dc, zoom);