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Maniphest T322462

Flow/TemplateHelper: Trying to access array offset on value of type null
Open, LowPublicPRODUCTION ERROR
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Description

Error
normalized_message
[{reqId}] {exception_url}   PHP Notice: Trying to access array offset on value of type null
exception.trace
from /srv/mediawiki/php-1.40.0-wmf.8/extensions/Flow/includes/TemplateHelper.php(578)
#0 /srv/mediawiki/php-1.40.0-wmf.8/extensions/Flow/includes/TemplateHelper.php(578): MWExceptionHandler::handleError(integer, string, string, integer, array)
#1 [internal function]: Flow\TemplateHelper::diffRevision(NULL, array)
#2 /srv/mediawiki/php-1.40.0-wmf.8/vendor/zordius/lightncandy/src/Runtime.php(706): call_user_func_array(string, array)
#3 /srv/mediawiki/php-1.40.0-wmf.8/vendor/zordius/lightncandy/src/Runtime.php(597): LightnCandy\Runtime::exch(array, string, array, array)
#4 /srv/mediawiki/php-1.40.0-wmf.8/extensions/Flow/handlebars/compiled/flow_block_topicsummary_diff_view.handlebars.php(47): LightnCandy\Runtime::hbch(array, string, array, string, array)
#5 /srv/mediawiki/php-1.40.0-wmf.8/extensions/Flow/includes/TemplateHelper.php(114): Flow\TemplateHelper->{closure}(array, array)
#6 /srv/mediawiki/php-1.40.0-wmf.8/extensions/Flow/includes/TemplateHelper.php(192): Flow\TemplateHelper::Flow\{closure}(array, array)
#7 /srv/mediawiki/php-1.40.0-wmf.8/extensions/Flow/includes/TemplateHelper.php(275): Flow\TemplateHelper::processTemplate(string, array)
#8 [internal function]: Flow\TemplateHelper::block(array, array)
#9 /srv/mediawiki/php-1.40.0-wmf.8/vendor/zordius/lightncandy/src/Runtime.php(706): call_user_func_array(string, array)
#10 /srv/mediawiki/php-1.40.0-wmf.8/vendor/zordius/lightncandy/src/Runtime.php(597): LightnCandy\Runtime::exch(array, string, array, array)
#11 /srv/mediawiki/php-1.40.0-wmf.8/extensions/Flow/handlebars/compiled/flow_block_loop.handlebars.php(33): LightnCandy\Runtime::hbch(array, string, array, string, array)
#12 /srv/mediawiki/php-1.40.0-wmf.8/vendor/zordius/lightncandy/src/Runtime.php(413): Flow\TemplateHelper->{closure}(array, array)
#13 /srv/mediawiki/php-1.40.0-wmf.8/extensions/Flow/handlebars/compiled/flow_block_loop.handlebars.php(34): LightnCandy\Runtime::sec(array, array, NULL, array, boolean, Closure)
#14 /srv/mediawiki/php-1.40.0-wmf.8/extensions/Flow/includes/TemplateHelper.php(114): Flow\TemplateHelper->{closure}(array, array)
#15 /srv/mediawiki/php-1.40.0-wmf.8/extensions/Flow/includes/View.php(376): Flow\TemplateHelper::Flow\{closure}(array)
#16 /srv/mediawiki/php-1.40.0-wmf.8/extensions/Flow/includes/View.php(87): Flow\View->renderApiResponse(array, array)
#17 /srv/mediawiki/php-1.40.0-wmf.8/extensions/Flow/includes/Actions/FlowAction.php(107): Flow\View->show(Flow\WorkflowLoader, string)
#18 /srv/mediawiki/php-1.40.0-wmf.8/extensions/Flow/includes/Actions/FlowAction.php(50): Flow\Actions\FlowAction->showForAction(string)
#19 /srv/mediawiki/php-1.40.0-wmf.8/includes/MediaWiki.php(543): Flow\Actions\FlowAction->show()
#20 /srv/mediawiki/php-1.40.0-wmf.8/includes/MediaWiki.php(323): MediaWiki->performAction(Article, Title)
#21 /srv/mediawiki/php-1.40.0-wmf.8/includes/MediaWiki.php(905): MediaWiki->performRequest()
#22 /srv/mediawiki/php-1.40.0-wmf.8/includes/MediaWiki.php(563): MediaWiki->main()
#23 /srv/mediawiki/php-1.40.0-wmf.8/index.php(50): MediaWiki->run()
#24 /srv/mediawiki/php-1.40.0-wmf.8/index.php(46): wfIndexMain()
#25 /srv/mediawiki/w/index.php(3): require(string)
#26 {main}
Impact

Seems fairly rare.

Notes

Seems like flow_block_topicsummary_diff_view.handlebars is invoked without passing in any data?

Details

Request URL
https://www.mediawiki.org/w/index.php?action=*&title=*&topicsummary_newRevision=*
Related Changes in Gerrit:
SubjectRepoBranchLines +/-
logspam.pl: Consolidate T322462 log messagesoperations/puppetproduction+1 -0
Customize query in gerrit

Related Objects

Event Timeline

Tgr created this task.Nov 5 2022, 4:24 AM
Restricted Application added a project: Growth-Team. · View Herald TranscriptNov 5 2022, 4:24 AM
Restricted Application added a subscriber: Aklapper. · View Herald Transcript
Tgr moved this task from Inbox to Triaged on the Growth-Team board.Nov 5 2022, 4:31 AM

Seems impossible (if I read the trace correctly, it would imply that TemplateHelper::processTemplate() is invoked with a null args, but it's type-hinted so it can't be null), rare enough that it's not really worth tracking down.

Krinkle moved this task from Untriaged to Nov 2022 on the Wikimedia-production-error board.Nov 17 2022, 4:47 PM
jnuche subscribed.Apr 20 2023, 11:24 AM

Still happening as of 1.41.0-wmf.5

The error is reproducible by hitting e.g. https://www.mediawiki.org/w/index.php?action=compare-post-revisions&title=Topic:Vxjd6shbjtv9v568&topic_newRevision=vxjmiu6ym6iiljcc&topic_oldRevision=vxjhnm3w7d0z0b2x Each hit to an affected URL generates six log entries.

There was a brief uptick shortly after the deployment of wmf.5 to group 2 this morning, however all instances of the error happen on mediawiki, which is part of group 0 and received wmf.5 on Tuesday. Interestingly, the revision history of the discussion page for the affected pages looks mangled right now: https://www.mediawiki.org/w/index.php?title=Talk:How_to_contribute&action=history The revision history for the page itself seems unaffected. The discussion revision history of other pages in mediawiki also looks healthy: https://www.mediawiki.org/w/index.php?title=Talk:Sites_using_MediaWiki&action=history

Michael merged a task: T344485: PHP Notice: Trying to access array offset on value of type null.May 27 2024, 3:47 PM
Michael added subscribers: Urbanecm_WMF, Etonkovidova.
dancy subscribed.May 28 2024, 7:05 PM

I saw a burst of these today, shortly after rolling the 1.43.0-wmf.7 train to group0. Looks like they come in batches of 6 per request. Each has a different line number in the range 556-578.

Error
normalized_message
[{reqId}] {exception_url}   PHP Notice: Trying to access array offset on value of type null
exception.trace
from /srv/mediawiki/php-1.43.0-wmf.7/extensions/Flow/includes/TemplateHelper.php(578)
#0 /srv/mediawiki/php-1.43.0-wmf.7/extensions/Flow/includes/TemplateHelper.php(578): MWExceptionHandler::handleError(integer, string, string, integer, array)
#1 [internal function]: Flow\TemplateHelper::diffRevision(NULL, array)
#2 /srv/mediawiki/php-1.43.0-wmf.7/vendor/zordius/lightncandy/src/Runtime.php(706): call_user_func_array(string, array)
#3 /srv/mediawiki/php-1.43.0-wmf.7/vendor/zordius/lightncandy/src/Runtime.php(597): LightnCandy\Runtime::exch(array, string, array, array)
#4 /srv/mediawiki/php-1.43.0-wmf.7/extensions/Flow/handlebars/compiled/flow_block_topic_diff_view.handlebars.php(39): LightnCandy\Runtime::hbch(array, string, array, string, array)
#5 /srv/mediawiki/php-1.43.0-wmf.7/extensions/Flow/includes/TemplateHelper.php(114): Flow\TemplateHelper->{closure}(array, array)
#6 /srv/mediawiki/php-1.43.0-wmf.7/extensions/Flow/includes/TemplateHelper.php(192): Flow\TemplateHelper::Flow\{closure}(array, array)
#7 /srv/mediawiki/php-1.43.0-wmf.7/extensions/Flow/includes/TemplateHelper.php(275): Flow\TemplateHelper::processTemplate(string, array)
#8 [internal function]: Flow\TemplateHelper::block(array, array)
#9 /srv/mediawiki/php-1.43.0-wmf.7/vendor/zordius/lightncandy/src/Runtime.php(706): call_user_func_array(string, array)
#10 /srv/mediawiki/php-1.43.0-wmf.7/vendor/zordius/lightncandy/src/Runtime.php(597): LightnCandy\Runtime::exch(array, string, array, array)
#11 /srv/mediawiki/php-1.43.0-wmf.7/extensions/Flow/handlebars/compiled/flow_block_loop.handlebars.php(33): LightnCandy\Runtime::hbch(array, string, array, string, array)
#12 /srv/mediawiki/php-1.43.0-wmf.7/vendor/zordius/lightncandy/src/Runtime.php(413): Flow\TemplateHelper->{closure}(array, array)
#13 /srv/mediawiki/php-1.43.0-wmf.7/extensions/Flow/handlebars/compiled/flow_block_loop.handlebars.php(34): LightnCandy\Runtime::sec(array, array, NULL, array, boolean, Closure)
#14 /srv/mediawiki/php-1.43.0-wmf.7/extensions/Flow/includes/TemplateHelper.php(114): Flow\TemplateHelper->{closure}(array, array)
#15 /srv/mediawiki/php-1.43.0-wmf.7/extensions/Flow/includes/View.php(376): Flow\TemplateHelper::Flow\{closure}(array)
#16 /srv/mediawiki/php-1.43.0-wmf.7/extensions/Flow/includes/View.php(88): Flow\View->renderApiResponse(array, array)
#17 /srv/mediawiki/php-1.43.0-wmf.7/extensions/Flow/includes/Actions/FlowAction.php(103): Flow\View->show(Flow\WorkflowLoader, string)
#18 /srv/mediawiki/php-1.43.0-wmf.7/extensions/Flow/includes/Actions/FlowAction.php(50): Flow\Actions\FlowAction->showForAction(string)
#19 /srv/mediawiki/php-1.43.0-wmf.7/includes/actions/ActionEntryPoint.php(731): Flow\Actions\FlowAction->show()
#20 /srv/mediawiki/php-1.43.0-wmf.7/includes/actions/ActionEntryPoint.php(508): MediaWiki\Actions\ActionEntryPoint->performAction(Article, MediaWiki\Title\Title)
#21 /srv/mediawiki/php-1.43.0-wmf.7/includes/actions/ActionEntryPoint.php(145): MediaWiki\Actions\ActionEntryPoint->performRequest()
#22 /srv/mediawiki/php-1.43.0-wmf.7/includes/MediaWikiEntryPoint.php(200): MediaWiki\Actions\ActionEntryPoint->execute()
#23 /srv/mediawiki/php-1.43.0-wmf.7/index.php(58): MediaWiki\MediaWikiEntryPoint->run()
#24 /srv/mediawiki/w/index.php(3): require(string)
#25 {main}
Impact
Notes
thcipriani subscribed.May 30 2024, 6:11 PM
Seems like this happens whenever someone uses compare-post-revisions on a Flow page. The net result is a page that shows something like:



This page shows the changes between two versions of a post by in the topic "[ ]" on [ ]. You can see other versions of this post at its [ history page].



Seeing lots of spikes of these recently, any investigation here appreciated <3
Etonkovidova added subscribers: Sgs, Michael.Jun 1 2024, 12:04 AM
brennen added a project: User-brennen.Dec 19 2024, 7:23 PM
brennen subscribed.
Still, unsurprisingly, a thing in 1.44.0-wmf.8 (T375667).
brennen moved this task from Backlog to Logs/Train on the User-brennen board.Dec 19 2024, 7:23 PM
Etonkovidova added a comment.Dec 23 2024, 7:26 PM


In T322462#10417018, @brennen wrote:


Still, unsurprisingly, a thing in 1.44.0-wmf.8 (T375667).





logstash link shows errors on testwiki and idwiki. I looked at one of the url on testwiki wmf.8 - https://test.wikipedia.org/w/index.php?action=compare-post-revisions&title=Topic:Tiickkn4twpce2xx&topic_newRevision=ujp0b4nd89sn23sk&topic_oldRevision=ufsvzmittut0lkj0. 


Screen Shot 2024-12-23 at 11.20.47 AM.png (714×2 px, 117 KB)
. The History states that the topics were deleted.



The example on idwiki can be viewed here.. The logstash error is easily triggered by visiting such pages and clicking on the links "Version by from".
Pppery merged a task: T387639: PHP Notice: Trying to access array offset on value of type null (via StructuredDiscussions TemplateHelper).Mar 3 2025, 6:14 AM
Pppery added a subscriber: Reedy.
Reedy added a comment.Mar 9 2025, 9:32 PM



Error





normalized_message
[{reqId}] {exception_url}   PHP Notice: Trying to access array offset on value of type null





FrameLocationCall


from/srv/mediawiki/php-1.44.0-wmf.19/extensions/Flow/includes/TemplateHelper.php(576)


#0/srv/mediawiki/php-1.44.0-wmf.19/extensions/Flow/includes/TemplateHelper.php(576)MWExceptionHandler::handleError(int, string, string, int, array)


#1[internal function]Flow\TemplateHelper::diffRevision(null, array)


#2/srv/mediawiki/php-1.44.0-wmf.19/vendor/zordius/lightncandy/src/Runtime.php(706)call_user_func_array(string, array)


#3/srv/mediawiki/php-1.44.0-wmf.19/vendor/zordius/lightncandy/src/Runtime.php(597)LightnCandy\Runtime::exch(array, string, array, array)


#4/srv/mediawiki/php-1.44.0-wmf.19/extensions/Flow/handlebars/compiled/flow_block_topic_diff_view.handlebars.php(39)LightnCandy\Runtime::hbch(array, string, array, string, array)


#5/srv/mediawiki/php-1.44.0-wmf.19/extensions/Flow/includes/TemplateHelper.php(114)Flow\TemplateHelper->{closure}(array, array)


#6/srv/mediawiki/php-1.44.0-wmf.19/extensions/Flow/includes/TemplateHelper.php(192)Flow\TemplateHelper::Flow\{closure}(array, array)


#7/srv/mediawiki/php-1.44.0-wmf.19/extensions/Flow/includes/TemplateHelper.php(275)Flow\TemplateHelper::processTemplate(string, array)


#8[internal function]Flow\TemplateHelper::block(array, array)


#9/srv/mediawiki/php-1.44.0-wmf.19/vendor/zordius/lightncandy/src/Runtime.php(706)call_user_func_array(string, array)


#10/srv/mediawiki/php-1.44.0-wmf.19/vendor/zordius/lightncandy/src/Runtime.php(597)LightnCandy\Runtime::exch(array, string, array, array)


#11/srv/mediawiki/php-1.44.0-wmf.19/extensions/Flow/handlebars/compiled/flow_block_loop.handlebars.php(33)LightnCandy\Runtime::hbch(array, string, array, string, array)


#12/srv/mediawiki/php-1.44.0-wmf.19/vendor/zordius/lightncandy/src/Runtime.php(413)Flow\TemplateHelper->{closure}(array, array)


#13/srv/mediawiki/php-1.44.0-wmf.19/extensions/Flow/handlebars/compiled/flow_block_loop.handlebars.php(34)LightnCandy\Runtime::sec(array, array, null, array, bool, Closure)


#14/srv/mediawiki/php-1.44.0-wmf.19/extensions/Flow/includes/TemplateHelper.php(114)Flow\TemplateHelper->{closure}(array, array)


#15/srv/mediawiki/php-1.44.0-wmf.19/extensions/Flow/includes/View.php(376)Flow\TemplateHelper::Flow\{closure}(array)


#16/srv/mediawiki/php-1.44.0-wmf.19/extensions/Flow/includes/View.php(88)Flow\View->renderApiResponse(array, array)


#17/srv/mediawiki/php-1.44.0-wmf.19/extensions/Flow/includes/Actions/FlowAction.php(100)Flow\View->show(Flow\WorkflowLoader, string)


#18/srv/mediawiki/php-1.44.0-wmf.19/extensions/Flow/includes/Actions/FlowAction.php(48)Flow\Actions\FlowAction->showForAction(string)


#19/srv/mediawiki/php-1.44.0-wmf.19/includes/actions/ActionEntryPoint.php(732)Flow\Actions\FlowAction->show()


#20/srv/mediawiki/php-1.44.0-wmf.19/includes/actions/ActionEntryPoint.php(509)MediaWiki\Actions\ActionEntryPoint->performAction(Article, MediaWiki\Title\Title)


#21/srv/mediawiki/php-1.44.0-wmf.19/includes/actions/ActionEntryPoint.php(145)MediaWiki\Actions\ActionEntryPoint->performRequest()


#22/srv/mediawiki/php-1.44.0-wmf.19/includes/MediaWikiEntryPoint.php(202)MediaWiki\Actions\ActionEntryPoint->execute()


#23/srv/mediawiki/php-1.44.0-wmf.19/index.php(58)MediaWiki\MediaWikiEntryPoint->run()


#24/srv/mediawiki/w/index.php(3)require(string)


#25{main}







Impact



Notes
Pppery mentioned this in T388726: PHP Warning: Trying to access array offset on value of type null.Mar 12 2025, 9:27 PM
Reedy merged a task: T388726: PHP Warning: Trying to access array offset on value of type null.Mar 12 2025, 9:42 PM
Reedy added a subscriber: Pppery.
Pppery unsubscribed.Mar 12 2025, 9:43 PM
Reedy added a comment.Mar 13 2025, 5:18 PM
^ Note that that is slightly different to the original flow_block_topicsummary_diff_view vs flow_block_topic_diff_view.handlebars
Reedy triaged this task as Low priority.Mar 13 2025, 5:23 PM
And is maybe more common, depending on page usage, and maybe because of the Flow board migration...



30 in the last hour, for example
Pppery added a comment.Mar 13 2025, 5:44 PM
This callstack isn't directly caused by Flow cleanup bot (which is still running manually churning through the big pile of edge cases). But it might be me viewing more Flow boards than usual to make sure that the bot is behaving correctly. Or it might be unrelated.
Pppery merged a task: T389882: PHP Warning: Trying to access array offset on value of type null (Flow).Mar 24 2025, 9:26 PM
Krinkle moved this task from Nov 2022 to Older on the Wikimedia-production-error board.Apr 1 2025, 1:12 AM
Pppery merged a task: T391387: PHP Warning: Trying to access array offset on value of type null.Apr 8 2025, 6:23 PM
Pppery subscribed.
Pppery unsubscribed.
dancy added a comment.May 28 2025, 3:47 PM
I saw a burst of similar errors today.  These are logged as PHP Warning rather than PHP Notice:



PHP Warning: Trying to access array offset on value of type null



Request URL:  https://ar.wikipedia.org/w/index.php?action=*&title=*&topicsummary_newRevision=*



Error





normalized_message
[{reqId}] {exception_url}   PHP Warning: Trying to access array offset on value of type null





FrameLocationCall


from/srv/mediawiki/php-1.45.0-wmf.2/extensions/Flow/includes/TemplateHelper.php(578)


#0/srv/mediawiki/php-1.45.0-wmf.2/extensions/Flow/includes/TemplateHelper.php(578)MediaWiki\Exception\MWExceptionHandler::handleError(int, string, string, int)


#1[internal function]Flow\TemplateHelper::diffRevision(null, array)


#2/srv/mediawiki/php-1.45.0-wmf.2/vendor/zordius/lightncandy/src/Runtime.php(706)call_user_func_array(string, array)


#3/srv/mediawiki/php-1.45.0-wmf.2/vendor/zordius/lightncandy/src/Runtime.php(597)LightnCandy\Runtime::exch(array, string, array, array)


#4/srv/mediawiki/php-1.45.0-wmf.2/extensions/Flow/handlebars/compiled/flow_block_topicsummary_diff_view.handlebars.php(47)LightnCandy\Runtime::hbch(array, string, array, string, array)


#5/srv/mediawiki/php-1.45.0-wmf.2/extensions/Flow/includes/TemplateHelper.php(115)Flow\TemplateHelper->{closure}(array, array)


#6/srv/mediawiki/php-1.45.0-wmf.2/extensions/Flow/includes/TemplateHelper.php(193)Flow\TemplateHelper::Flow\{closure}(array, array)


#7/srv/mediawiki/php-1.45.0-wmf.2/extensions/Flow/includes/TemplateHelper.php(276)Flow\TemplateHelper::processTemplate(string, array)


#8[internal function]Flow\TemplateHelper::block(array, array)


#9/srv/mediawiki/php-1.45.0-wmf.2/vendor/zordius/lightncandy/src/Runtime.php(706)call_user_func_array(string, array)


#10/srv/mediawiki/php-1.45.0-wmf.2/vendor/zordius/lightncandy/src/Runtime.php(597)LightnCandy\Runtime::exch(array, string, array, array)


#11/srv/mediawiki/php-1.45.0-wmf.2/extensions/Flow/handlebars/compiled/flow_block_loop.handlebars.php(33)LightnCandy\Runtime::hbch(array, string, array, string, array)


#12/srv/mediawiki/php-1.45.0-wmf.2/vendor/zordius/lightncandy/src/Runtime.php(413)Flow\TemplateHelper->{closure}(array, array)


#13/srv/mediawiki/php-1.45.0-wmf.2/extensions/Flow/handlebars/compiled/flow_block_loop.handlebars.php(34)LightnCandy\Runtime::sec(array, array, null, array, bool, Closure)


#14/srv/mediawiki/php-1.45.0-wmf.2/extensions/Flow/includes/TemplateHelper.php(115)Flow\TemplateHelper->{closure}(array, array)


#15/srv/mediawiki/php-1.45.0-wmf.2/extensions/Flow/includes/View.php(376)Flow\TemplateHelper::Flow\{closure}(array)


#16/srv/mediawiki/php-1.45.0-wmf.2/extensions/Flow/includes/View.php(88)Flow\View->renderApiResponse(array, array)


#17/srv/mediawiki/php-1.45.0-wmf.2/extensions/Flow/includes/Actions/FlowAction.php(100)Flow\View->show(Flow\WorkflowLoader, string)


#18/srv/mediawiki/php-1.45.0-wmf.2/extensions/Flow/includes/Actions/FlowAction.php(48)Flow\Actions\FlowAction->showForAction(string)


#19/srv/mediawiki/php-1.45.0-wmf.2/includes/actions/ActionEntryPoint.php(728)Flow\Actions\FlowAction->show()


#20/srv/mediawiki/php-1.45.0-wmf.2/includes/actions/ActionEntryPoint.php(505)MediaWiki\Actions\ActionEntryPoint->performAction(MediaWiki\Page\Article, MediaWiki\Title\Title)


#21/srv/mediawiki/php-1.45.0-wmf.2/includes/actions/ActionEntryPoint.php(143)MediaWiki\Actions\ActionEntryPoint->performRequest()


#22/srv/mediawiki/php-1.45.0-wmf.2/includes/MediaWikiEntryPoint.php(198)MediaWiki\Actions\ActionEntryPoint->execute()


#23/srv/mediawiki/php-1.45.0-wmf.2/index.php(58)MediaWiki\MediaWikiEntryPoint->run()


#24/srv/mediawiki/w/index.php(3)require(string)


#25{main}







These arrive in batches of 6 at different line numbers (making it particularly spammy for log watchers).
gerritbot added a comment.Jul 15 2025, 6:36 PM
Change #1169728 had a related patch set uploaded (by Ahmon Dancy; author: Ahmon Dancy):



[operations/puppet@production] logspam.pl: Consolidate T322462 log messages



https://gerrit.wikimedia.org/r/1169728
gerritbot added a project: Patch-For-Review.Jul 15 2025, 6:36 PM
gerritbot added a comment.Jul 15 2025, 6:44 PM
Change #1169728 merged by Dzahn:



[operations/puppet@production] logspam.pl: Consolidate T322462 log messages



https://gerrit.wikimedia.org/r/1169728
Maintenance_bot removed a project: Patch-For-Review.Jul 15 2025, 7:31 PM
Urbanecm_WMF removed a project: Growth-Team.Oct 28 2025, 12:27 AM
brennen added a project: Unstewarded-production-error.Mar 12 2026, 7:46 PM
Still occurring in 1.46.0-wmf.19 (T413810). Rate seems slightly elevated since wmf.16 or so, for whatever reason.
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