Thread:Extension talk:Lingo/Error: Strict Standards: Only variables should be assigned by reference in C:\xampp\htdocs\wiki\extensions\Lingo\Lingo.php on line 89

After installation according to: http://www.mediawiki.org/wiki/Extension:Lingo I get: Error: Strict Standards: Only variables should be assigned by reference in C:\xampp\htdocs\wiki\extensions\Lingo\Lingo.php on line 89

Is this a known solution, how can I solve this ?