Index: Slim/Utils/Prefs.pm
===================================================================
--- Slim/Utils/Prefs.pm	(revision 2902)
+++ Slim/Utils/Prefs.pm	(working copy)
@@ -134,7 +134,9 @@
 	if ((!-e $CacheDir && !-w $CacheParent) || (-e $CacheDir && !-w $CacheDir)) {
 		$CacheDir = undef;
 	}
-	mkpath $CacheDir if (!-e $CacheDir);
+	if (defined $CacheDir && !-d $CacheDir) {
+		mkpath($CacheDir);
+	}
 	return $CacheDir;
 }