diff --git a/HZH_Controls/HZH_Controls/Controls/GraphicalOverlay/GraphicalOverlayComponent.cs b/HZH_Controls/HZH_Controls/Controls/GraphicalOverlay/GraphicalOverlayComponent.cs
index f2cba16c60a4357439b6aaf1511a5e5447ce68a4..67c6ce3f40e3036e486fa90f6586f6041b0af914 100644
--- a/HZH_Controls/HZH_Controls/Controls/GraphicalOverlay/GraphicalOverlayComponent.cs
+++ b/HZH_Controls/HZH_Controls/Controls/GraphicalOverlay/GraphicalOverlayComponent.cs
@@ -79,6 +79,8 @@ namespace HZH_Controls.Controls
 
         private void Control_Paint(object sender, PaintEventArgs e)
         {
+            if (e == null) return;
+
             // As each control on the form is repainted, this handler is called.
 
             Control control = sender as Control;