Weird. I can't reproduce this on 1.12rc1 or 1.13svn. Could you attach the wikitext of the page you're trying to edit? I saw ===Vaults===?[[ in your backtrace, which would be an invalid header (although that should be handled more gracefully, of course).

k9disc wrote:

Well, now my edit links for the sections are gone. Talk about weird...

Here's the wiki text from one of the sections:

Moving Back Vault

[[Image:shock.jpg|thumbnail]]
A moving Back Vault takes place when the handler is in motion as the dog is executing the vault.

There has always been a little bit of handler motion in Back Vault execution, but in recent years this motion has become significant enough to create an entirely new kind of vault.

[[Gary Shockley]] and Kodiak were pioneers in this dynamic trick in the United States and it's one of the defining aspects of their game that led them to a stellar 2002 competition season.

The history of the development of the Moving Back Vault in Japan is unclear, but one thing that is not unclear is that the Japanese players ([[Yachi Harai]]) have taken the Moving Back Vault to an entirely different level and have given the entire Disc Dog world a new avenue for evolution and creativity.

Thanks,
Ron

(In reply to comment #2)

Well, now my edit links for the sections are gone.

Are you sure you're not viewing a diff or an old version of the page?

rene.raule wrote:

I had the same problem with MW 1.12.0rc1. Solution:

Change in Preprocessor_DOM.php , function splitHeading

if( !this->nodeName == 'h')

to

if( !this->getName() == 'h')

Rene

anon.hui wrote:

I got the same error in mw 1.14.0 (php 5.0.5).
But on another machine that use mw 1.14.0 on php 5.2.4 cannot reproduce this.

anon.hui wrote:

http://www.nabble.com/%22Invalid-h-node-passed-to-PPNode_DOM::splitHeading%22-error-on-1.12-td16331196.html
<blockquote>
Try using the alternate preprocessor code; add this to your
LocalSettings.php:

$wgParserConf['preprocessorClass'] = 'Preprocessor_Hash';
</blockquote>

From reading the linked thread in comment #6, it seems to have been a combination of using Preprocessor_DOM and old 5.0.x PHP.

Closing as WFM. Feel free to reopen if you can replicate on a more recent version of Mediawiki and PHP (note we only support PHP 5.1 and higher--5.2 or 5.3 is recommended).