WikiDB error

Hi folks,
 
 today I received the following error:
 
 Fatal PhpWiki Error
 
 lib/WikiDB.php:973: Fatal[0]: <br
 />/var/www/projectdirs/wiki/lib/WikiDB.php:973: : Assertion failed <br />
 
 I get this message when I try to look at pagehistory or diff.
 
 What is the problem?
 
 This is phpWiki 1.3.10
 
 Thanks,
 
 Krisztian


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