Hey Tim,
The notice is
Notice: Undefined property: ParserOutput::$mSMWData in /home/j/www/phase3/extensions/SemanticMediaWiki/includes/SMW_ParseData.php on line 170
Looking at this again I figure it might indeed not be set and that I accidentally fixed this while updating the code to use the modification I submitted to core. The notice is occurring when I run the Wikibase tests, which I only very recently started running when SMW is loaded (since content handler is in core), so it might be related to that. Will investigate tomorrow.
In any case, do you think it's fine for extensions to set such non-defined fields, or would it be better to go in the direction of the patch that's on gerrit? https://gerrit.wikimedia.org/r/#/c/28767/
Cheers
-- Jeroen De Dauw http://www.bn2vs.com Don't panic. Don't be evil. --