Question Messages are no longer displayed since update 5.1.31.1

Webmaster for 23 years and Kunena user since its beginnings, I come to ask for help for the first time (if my memory is good).

Since today's update to 5.1.31.1, messages are no longer displayed. Please see:

www.apiservices.biz/fr/forums/messagesrecents

Click on one of the topics, there is an error page

Thank you for your help. Here is my config:

Database collation check: ✔ The collation of your table fields are correct

Joomla! SEF: Enabled | Joomla! SEF rewrite: Enabled | FTP layer: Disabled |

This message contains confidential information

htaccess: Exists | PHP environment: Max execution time: 300 seconds | Max execution memory: 512M | Max file upload: 128M

Kunena menu details:

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ID	Name	Menutype	Link	Path	In trash
745	Index général	mainmenu-fr	view=category&layout=list&catid=0	forums/index-general	No
746	Sujets récents	mainmenu-fr	view=topics&mode=replies	forums/messagesrecents	No
747	Poster un nouveau sujet	mainmenu-fr	view=topic&layout=create	forums/nouveau-sujet	No
748	Sujets sans réponse	mainmenu-fr	view=topics&mode=noreplies	forums/sansreponse	No
749	Mes sujets	mainmenu-fr	view=topics&layout=user&mode=default	forums/mesrecents	No
753	Rechercher	mainmenu-fr	view=search	forums/recherche	No
754	Statistiques des forums	mainmenu-fr	view=statistics	forums/statisques-des-forums	No
750	Modifier mon profil	mainmenu-fr	view=user	forums/profil	No
911	forum	kunenamenu	view=home&defaultmenu=913	forum	No
912	Index	kunenamenu	view=category&layout=list	forum/index	No
913	Sujets récents	kunenamenu	view=topics&mode=replies	forum/messagesrecents	No
914	Nouveau sujet	kunenamenu	view=topic&layout=create	forum/nouveausujet	No
915	Pas de réponse	kunenamenu	view=topics&mode=noreplies	forum/sansreponse	No
916	Mes sujets	kunenamenu	view=topics&layout=user&mode=default	forum/mesrecents	No
917	Profil	kunenamenu	view=user	forum/profil	No
919	Recherche	kunenamenu	view=search	forum/recherche	No

Joomla default template details : protostar | author: Kyle Ledbetter | version: 1.0 | creationdate: 4/30/2012

Kunena default template details : Crypsis | author: Kunena Team | version: 5.1.13.1 | creationdate: 2019-07-22

Kunena template params:

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DefaultCategoryicon	icon-folder
profileIconset	default
DefaultIconset	default
editorIconset	default
lightboxColor	white
bootstrap	0
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borderless	0
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displayBreadcrumb	1
displayAnnouncement	1
displayFooter	1
avatarPosition	left
avatarType	img-circle
labels	0
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formRecover	0
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socialsharetag
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avatarSizeYPost	144
avatarSizeXProfile	200
avatarSizeYProfile	200
optional_username	0
editor	0
wysibb
templatebyText
templatebyName
templatebyLink

Kunena version detailed: Kunena 5.1.13.1 | 2019-07-22 [ Mimas ]
| Kunena detailed configuration:

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Kunena config settings:
board_offline	0
enablerss	0
threads_per_page	30
messages_per_page	30
messages_per_page_search	30
showhistory	1
historylimit	30
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template	crypsis
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filetypes	xls,xlsx,txt,rtf,pdf,zip,tar.gz,tgz,tar.bz2
filesize	500
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| Kunena integration settings:

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Kunena - Finder Disabled
Kunena - AltaUserPoints Disabled
Kunena - Community Builder Disabled
Kunena - Easyblog Disabled
Kunena - Easyprofile Disabled
Kunena - Easysocial Disabled
Kunena - Gravatar Disabled
Kunena - JomSocial Disabled
Kunena - Joomla Enabled: access=1 login=1
Kunena - Kunena Enabled: avatar=1 profile=1
Kunena - UddeIM Enabled: private=1

| Joomla! detailed language files installed:

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Joomla! languages installed:
it-IT	Italian (IT)
es-ES	Spanish (español)
en-GB	English (en-GB)
fr-FR	French (FR)
de-DE	German (DE)

Third-party components: UddeIM 4.0

Third-party SEF components: None

Plugins: Search - Kunena Search 5.1.1

Modules: Kunena Latest 5.1.1 | Kunena Stats 5.1.1 | Kunena Login 5.1.1 | Kunena Search 5.1.1

Well I made a restoration J-3 and returned to the version Kunena 5.0.14 which works flawlessly. So my question: is there a known problem to upgrade from 5.0.14 to 5.1.31.1?

You need to clear cache, this is usually the issue.