Thread:Project:Support desk/upgrading MediaWiki to Version 1.17.2/reply

The PHP update command runs 3 seconds and that's it, no errors showing. The only error we find was in the PHP logs [15-Mar-2012 12:26:02] PHP Fatal error: Call to a member function setCacheTime on a non-object in D:\Websrv\Apache2\WebSites\...\wiki\includes\parser\Parser.php on line 4771

Most likely an extension doing something like  while not parsing anything. (Some older extensions seem to make weird assumptions about if stuff is currently being parsed which don't make a lot of sense. Starting in 1.19 with r106310 a much more informative error would be given for this situation).

Try disabling all extensions, and see if it works.