This is expected. You should not make assumptions about the state of the global Parser instance in a special page. In some circumstances (especially transclusions) it might be in a parse, other times it won't be.

If you're rendering an i18n message, its better to use ->parse() of the Message class then to pass it through the parser directly.

Alternatively use \MediaWiki\MediaWikiServices::getInstance()->getParser()->getFreshParser() and then initialize it yourself by calling ->parse() on the Parser, so you always know what the state is for sure.


On Fri, Jun 11, 2021 at 9:27 AM Sebastian Trueg <> wrote:
Hi everyone,

my skin uses the global parser in order to render some parts of the
navigation bar via templates (Parser::recursivePreprocess). This works
fine on all normal pages (and even some special ones like
Special:Version), but not on special pages like Special:AllPages.

Some debugging revealed that on Special:AllPages the global parser
object (\MediaWiki\MediaWikiServices::getInstance()->getParser()) is not
properly initialized. Member variables like mOptions and mTitle are null
which results in tons of NPEs.

Any idea why that is? Is that a bug or am I mis-using the parser?

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