Please see this page in Portuguese Wikipedia. Ordinarily, when we try to move a page to other title, and this title already exists (a history of three revisions, e.g.), eliminators/administrators have the option of delete that page ('Yes, delete page'), as in other wikis. But, there is a bug that when we mark to delete page, it is displayed the following error "[XDomdgpAADgAAJv80TAAAABT] 2019-01-12 17:40:07: Fatal exception of type MWException". Could you help us? Regards, Pórokhov.
MWException from line 497 of /srv/mediawiki/php-1.33.0-wmf.12/includes/MovePage.php: Failed to delete page-move revision: <OK, collected 1 error(s) on the way, no value set>
+------+---------------------------+------------------------------------------+
| 1 | cannotdelete | Usuário:Pórokhov/Testes234 |
+------+---------------------------+------------------------------------------+
{"exception_id":"XDomdgpAADgAAJv80TAAAABT","exception_url":"/w/index.php?title=Especial:Mover_p%C3%A1gina&action=submit","caught_by":"mwe_handler"}
[Exception MWException] (/srv/mediawiki/php-1.33.0-wmf.12/includes/MovePage.php:497) Failed to delete page-move revision: <OK, collected 1 error(s) on the way, no value set>
+------+---------------------------+------------------------------------------+
| 1 | cannotdelete | Usuário:Pórokhov/Testes234 |
+------+---------------------------+------------------------------------------+
#0 /srv/mediawiki/php-1.33.0-wmf.12/includes/MovePage.php(263): MovePage->moveToInternal(User, Title, string, boolean, array)
#1 /srv/mediawiki/php-1.33.0-wmf.12/includes/specials/SpecialMovepage.php(608): MovePage->move(User, string, boolean)
#2 /srv/mediawiki/php-1.33.0-wmf.12/includes/specials/SpecialMovepage.php(128): MovePageForm->doSubmit()
#3 /srv/mediawiki/php-1.33.0-wmf.12/includes/specialpage/SpecialPage.php(569): MovePageForm->execute(NULL)
#4 /srv/mediawiki/php-1.33.0-wmf.12/includes/specialpage/SpecialPageFactory.php(558): SpecialPage->run(NULL)
#5 /srv/mediawiki/php-1.33.0-wmf.12/includes/MediaWiki.php(288): MediaWiki\Special\SpecialPageFactory->executePath(Title, RequestContext)
#6 /srv/mediawiki/php-1.33.0-wmf.12/includes/MediaWiki.php(862): MediaWiki->performRequest()
#7 /srv/mediawiki/php-1.33.0-wmf.12/includes/MediaWiki.php(517): MediaWiki->main()
#8 /srv/mediawiki/php-1.33.0-wmf.12/index.php(42): MediaWiki->run()
#9 /srv/mediawiki/w/index.php(3): include(string)
#10 {main}