Issue:Call to a member function getPrefixedDBkey() on a non-object

Description:	Call to a member function getPrefixedDBkey() on a non-object
Extension / Version:	DPL   /   1.7.3
Type / Status:	Bug   /   open

Problem

From file version 20080505195057!Semeb_extensions.zip onwards, using mediawiki 1.12.0 I get this error when accessing any page that uses DPL:

Fatal error: Call to a member function getPrefixedDBkey() on a non-object in /var/www/mediawiki-1.12.0/includes/Preprocessor_DOM.php on line 972

Previous versions are OK.

Test Case

Test case now on this wiki (since upgrade to 1.13): paste the following into a page.

{{#dpl:
| uses=Template:Issue
| include={Issue}:Description,#Problem[200]
| table=class="wikitable sortable", Issue,Problem
}}

Ianb1469 19:26, 27 August 2008 (UTC)

Reply

I was able to track the problem down to two minimalistic files, called Xxx and Yyy. Xxx contains the following code

{{#dpl:
| titlematch=%Yyy%
| include=#X
}}

But the offending statement comes from the parser itself. Could you please try to involve those people who made the new parser?

Gero 21:19, 27 August 2008 (UTC)

Is there a test case that triggers this without using DPL then? Ianb1469 05:13, 28 August 2008 (UTC)

Unfortunately not, so far. Maybe I can shrink the code down, but I guess the effect can only be shown if one writes an extension which calls that parser function in a certain way. I am pretty sure that the calling code does not pass any corrupted paranmeters but this has still to be shown. Can you program or at least read php? Gero 06:59, 28 August 2008 (UTC)

No, I've never really programmed php. I've plenty of Ada, C and Perl experience, so I could probably make sense of it, but writing php definitely not. Ianb1469 18:52, 28 August 2008 (UTC)

Parser function only

Hi, I also have the same problem but I realised the error only appears when {{#dpl:}} syntax is used instead of <DPL></DPL>, which works correctly. -EmuWikiAdmin1 - July 19th 2008

Heading Inclusion

I realised that Line 972 was meant to threat some data related to heading and I tried removing the heading (=Heading Example=) from my list separators and it worked. So basically it's a problem with heading generation -EmuWikiAdmin1 - July 20th 2008

Yes, this seems to be the case. The first example triggers the bug, the second does not. (Mwiki 1.12, DPL 1.7.6)

Triggers bug:
{{#dpl:
| category=test
| include={template1}:name,#Chaptername
| table=class="wikitable sortable", X,Y,Z
}}

OK:
{{#dpl:
| category=test
| include={template1}:name
| table=class="wikitable sortable", X,Y,Z
}}

Ianb1469 00:33, 27 August 2008 (CEST)

Occurring in MW 1.13.0

I just started getting this problem after a MediaWiki 1.13.0 upgrade. Here is the DPL query in question:

{{#dpl:
|category = My category name
|format = ,\n=[[%PAGE%|%TITLE%]]=\n\n,,
|includepage = %0
|includetrim = true
|noresultsheader = No entries
|ordercollation = latin1_general_ci
|reset = templates
}}

All articles in the category are in the Template namespace.

The error is:

Fatal error: Call to a member function getPrefixedDBkey() on a non-object in ...\includes\parser\Preprocessor_DOM.php on line 994

The line is:

$titleText = $this->title->getPrefixedDBkey();

in function expand(). The above example worked fine in 1.12.0. --Maiden taiwan 16:10, 20 August 2008 (CEST)

Related Error Message

It may be unrelated, but it sometimes occurs with two other error messages (dpl 1.7.6_

Notice: Uninitialized string offset: 0 in /var/www/mediawiki-1.12.0/extensions/DynamicPageList-1.7.4/DynamicPageList2.php on line 2351

Notice: Uninitialized string offset: 0 in /var/www/mediawiki-1.12.0/extensions/DynamicPageList-1.7.4/DynamicPageList2.php on line 2351

Fatal error: Call to a member function getPrefixedDBkey() on a non-object in /var/www/mediawiki-1.12.0/includes/Preprocessor_DOM.php on line 972 Ianb1469 00:40, 27 August 2008 (CEST)