diff --git a/DarkUI/Controls/DarkComboBox.cs b/DarkUI/Controls/DarkComboBox.cs
index 716ce4b..e1ee4b2 100644
--- a/DarkUI/Controls/DarkComboBox.cs
+++ b/DarkUI/Controls/DarkComboBox.cs
@@ -104,6 +104,8 @@ protected override void OnResize(EventArgs e)
 
         private void PaintCombobox()
         {
+            if (ClientRectangle.Width <= 0 || ClientRectangle.Height <= 0)
+                _buffer = new Bitmap(1, 1);
             if (_buffer == null)
                 _buffer = new Bitmap(ClientRectangle.Width, ClientRectangle.Height);