diff --git a/PreferencesManager.cs b/PreferencesManager.cs
index c65b5fa..56a2c79 100644
--- a/PreferencesManager.cs
+++ b/PreferencesManager.cs
@@ -315,7 +315,7 @@ private T LoadPrefByScreen<T>(int screenNum, string prefBaseName, string primary
                 // look for the non-screen-specific pref setting, and if found, move it from there.
                 // This is a one-off preferences upgrade.
 
-                if (Screen.AllScreens.Length == 1 || Screen.AllScreens.Length >= screenNum && Screen.AllScreens[screenNum].Primary)
+                if (Screen.AllScreens.Length == 1 || (screenNum < Screen.AllScreens.Length && Screen.AllScreens[screenNum].Primary))
                 {
                     if (reg.GetValueNames().Contains(prefBaseName))
                     {