diff --git a/src/main/java/com/jthemedetecor/MacOSThemeDetector.java b/src/main/java/com/jthemedetecor/MacOSThemeDetector.java
index 357ed04..fff9462 100644
--- a/src/main/java/com/jthemedetecor/MacOSThemeDetector.java
+++ b/src/main/java/com/jthemedetecor/MacOSThemeDetector.java
@@ -94,7 +94,7 @@ public boolean isDark() {
     }
 
     private boolean isDarkTheme(String themeName) {
-        return themeNamePattern.matcher(themeName).matches();
+        return themeName != null && themeNamePattern.matcher(themeName).matches();
     }
 
     @Override