diff --git a/app/AsusMouseSettings.cs b/app/AsusMouseSettings.cs
index 220270f8..73301edc 100644
--- a/app/AsusMouseSettings.cs
+++ b/app/AsusMouseSettings.cs
@@ -326,6 +326,12 @@ private void ComboBoxLightingMode_DropDownClosed(object? sender, EventArgs e)
                 return;
             }
 
+            if (comboBoxLightingMode.SelectedIndex >= supportedLightingModes.Count)
+            {
+                // Unsupported mode
+                return;
+            }
+
             LightingMode lm = supportedLightingModes[comboBoxLightingMode.SelectedIndex];
 
             LightingSetting? ls = mouse.LightingSettingForZone(visibleZone);