[{reqId}] {exception_url}   Flow\Exception\PermissionException: Insufficient permission to compare revisions

from /srv/mediawiki/php-1.43.0-wmf.6/extensions/Flow/includes/Formatter/RevisionViewQuery.php(104)
#0 /srv/mediawiki/php-1.43.0-wmf.6/extensions/Flow/includes/Block/TopicBlock.php(624): Flow\Formatter\RevisionViewQuery->getDiffViewResult(Flow\Model\UUID, Flow\Model\UUID)
#1 /srv/mediawiki/php-1.43.0-wmf.6/extensions/Flow/includes/Block/TopicBlock.php(546): Flow\Block\TopicBlock->renderDiffViewApi(array)
#2 /srv/mediawiki/php-1.43.0-wmf.6/extensions/Flow/includes/View.php(233): Flow\Block\TopicBlock->renderApi(array)
#3 /srv/mediawiki/php-1.43.0-wmf.6/extensions/Flow/includes/View.php(72): Flow\View->buildApiResponse(Flow\WorkflowLoader, array, string, array)
#4 /srv/mediawiki/php-1.43.0-wmf.6/extensions/Flow/includes/Actions/FlowAction.php(103): Flow\View->show(Flow\WorkflowLoader, string)
#5 /srv/mediawiki/php-1.43.0-wmf.6/extensions/Flow/includes/Actions/FlowAction.php(50): Flow\Actions\FlowAction->showForAction(string)
#6 /srv/mediawiki/php-1.43.0-wmf.6/includes/actions/ActionEntryPoint.php(731): Flow\Actions\FlowAction->show()
#7 /srv/mediawiki/php-1.43.0-wmf.6/includes/actions/ActionEntryPoint.php(508): MediaWiki\Actions\ActionEntryPoint->performAction(Article, MediaWiki\Title\Title)
#8 /srv/mediawiki/php-1.43.0-wmf.6/includes/actions/ActionEntryPoint.php(145): MediaWiki\Actions\ActionEntryPoint->performRequest()
#9 /srv/mediawiki/php-1.43.0-wmf.6/includes/MediaWikiEntryPoint.php(200): MediaWiki\Actions\ActionEntryPoint->execute()
#10 /srv/mediawiki/php-1.43.0-wmf.6/index.php(58): MediaWiki\MediaWikiEntryPoint->run()
#11 /srv/mediawiki/w/index.php(3): require(string)
#12 {main}