http://pl.wikisource.org/w/index.php?title=Odezwa_do_żołnierzy_Polskich_Sił_Zbrojnych_(1977)

generates the following error:

PHP fatal error in /usr/local/apache/common-local/php-1.21wmf1/includes/Title.php line 4154:
Argument 1 passed to Title::equals() must be an instance of Title, null given, called in /usr/local/apache/common-local/php-1.21wmf1/extensions/ProofreadPage/ProofreadPage.body.php on line 960 and defined

Edition of this page works, but no change is accepted.
Maybe, thit is because the transcluded page contains two commas in filename.

Version: unspecified
Severity: normal