diff --git a/src/ACadSharp.Pdf/Core/IO/PdfPen.cs b/src/ACadSharp.Pdf/Core/IO/PdfPen.cs
index 0c72590..29f2e8a 100644
--- a/src/ACadSharp.Pdf/Core/IO/PdfPen.cs
+++ b/src/ACadSharp.Pdf/Core/IO/PdfPen.cs
@@ -45,6 +45,8 @@ public void DrawEntity(Entity entity, Transform transform)
 				case Circle circle:
 					this.drawCircle(circle, transform);
 					break;
+				case Dimension dimension:
+					throw new System.NotImplementedException();
 				case Line line:
 					this.drawLine(line, transform);
 					break;