Copypaste error. This could be avoided by doing $theme[] in stead of $theme[n]

but I'm not doing that in this phase. Will probably be changed in 1.5 so no
bother. Thanks David Walsner for reporting

config/config_default.php

@@ -375,8 +375,8 @@ $theme[32]['NAME'] = 'Alien Glow';
 $theme[33]['PATH'] = '../themes/dark_green.php';
 $theme[33]['NAME'] = 'Dark Green';
 
-$theme[33]['PATH'] = '../themes/penguin.php';
-$theme[33]['NAME'] = 'Penguin';
+$theme[34]['PATH'] = '../themes/penguin.php';
+$theme[34]['NAME'] = 'Penguin';
 
 /**
  * LDAP server(s)