Question Missing usernames in frontend after update 5.1.0

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

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htaccess: Exists | PHP environment: Max execution time: 30 seconds | Max execution memory: 256M | Max file upload: 200M

Kunena menu details:

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ID	Name	Menutype	Link	Path	In trash
132	Forum	hauptmenue	Itemid=123	zum-forum	No
123	Forum	kunenamenu	view=home&defaultmenu=123	forum	No
124	Index	kunenamenu	view=category&layout=list&catid=0	forum/index	No
125	Aktuell	kunenamenu	view=topics&mode=replies	forum/aktuell	No
126	Neues Thema	kunenamenu	view=topic&layout=create	forum/neuesthema	No
127	Ohne Antwort	kunenamenu	view=topics&mode=noreplies	forum/ohneantwort	No
128	Meine Themen	kunenamenu	view=topics&layout=user&mode=default	forum/meinethemen	No
129	Profil	kunenamenu	view=user	forum/profil	No
130	Hilfe	kunenamenu	view=misc	forum/hilfe	No
131	Suche	kunenamenu	view=search	forum/suche	No

Joomla default template details : yootheme | author: YOOtheme | version: 1.11.9 | creationdate: May 2018

Kunena default template details : Crypsis | author: Kunena Team | version: 5.1.0 | creationdate: 2018-05-13

Kunena template params:

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{"DefaultCategoryicon":"","profileIconset":"default","DefaultIconset":"default","editorIconset":"default","lightboxColor":"white","bootstrap":"0","icomoon":"1","tooltips":"1","borderless":"1","SubjectLengthMessage":"80","fullactions":"1","quick":"0","displayMenu":"1","displayDropdownMenu":"1","displayDropdownContent":"1","displayModule":"1","displayBreadcrumb":"1","displayAnnouncement":"1","displayFooter":"1","avatarPosition":"left","avatarType":"none","labels":"1","whoisonlineName":"default","formRecover":"0","topicicontype":"B2","fontawesome":"0","socialshare":"0","socialsharetag":"","socialtheme":"classic","optional_username":"1","writeaccess":"0","localstorage":"0","IconColor":"inherit","IconColorNew":"#48a348","editor":"0","video":"1","maps":"1","emoticons":"1","twitter":"1","ebay":"1","link":"1","picture":"1","hide":"1","spoiler":"1","table":"1","code":"1","quote":"1","divider":"1","instagram":"1","soundcloud":"1","confidential":"1","hr":"1","listitem":"1","supscript":"1","subscript":"1","numericlist":"1","bulletedlist":"1","alignright":"1","alignleft":"1","center":"1","underline":"1","italic":"1","bold":"1","strikethrough":"1","colors":"1","size":"1","wysibb":"bold,italic,underline,strike,sup,sub,justifyleft,justifycenter,justifyright,|,img,video,link,|,bullist,numlist,|,fontcolor,fontsize,fontfamily,|,quote,code,table,removeFormat","avatarSizeX":"40","avatarSizeY":"90","avatarSizeXThumb":"36","avatarSizeYThumb":"36","avatarSizeXWelcome":"72","avatarSizeYWelcome":"72","avatarSizeXList":"36","avatarSizeYList":"36","avatarSizeXPost":"144","avatarSizeYPost":"144","avatarSizeXProfile":"200","avatarSizeYProfile":"200","templatebyText":"","templatebyName":"","templatebyLink":""}

Kunena version detailed: Kunena 5.1.0 | 2018-05-13 [ Ariel ]
| Kunena detailed configuration:

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Kunena config settings:
board_offline	0
enablerss	1
threads_per_page	20
messages_per_page	6
messages_per_page_search	15
showhistory	1
historylimit	6
shownew	1
disemoticons	0
template	crypsis
showannouncement	1
avataroncat	0
catimagepath	category_images
showchildcaticon	1
rtewidth	450
rteheight	300
enableforumjump	1
reportmsg	1
username	1
askemail	0
showemail	0
showuserstats	1
showkarma	1
useredit	1
useredittime	0
useredittimegrace	600
editmarkup	1
allowsubscriptions	1
subscriptionschecked	1
allowfavorites	1
maxsubject	50
maxsig	300
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floodprotection	0
mailmod	0
mailadmin	0
captcha	0
mailfull	1
allowavatarupload	1
allowavatargallery	1
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imageheight	2560
imagewidth	2560
imagesize	5000
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filesize	6000
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rankimages	1
userlist_rows	30
userlist_online	1
userlist_avatar	1
userlist_posts	1
userlist_karma	1
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userlist_lastvisitdate	1
userlist_userhits	1
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showwhoisonline	1
showgenstats	1
showpopuserstats	1
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showpopsubjectstats	1
popsubjectcount	5
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showvideotag	1
showebaytag	1
trimlongurls	1
trimlongurlsfront	40
trimlongurlsback	20
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autoembedebay	1
ebaylanguagecode	en-us
sessiontimeout	1800
highlightcode	0
rss_type	topic
rss_timelimit	month
rss_limit	100
rss_included_categories
rss_excluded_categories
rss_specification	rss2.0
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pollnbvotesbyuser	100
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post_dateformat_hover	datetime
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imagemimetypes	image/jpeg,image/jpg,image/gif,image/png
imagequality	50
thumbheight	164
thumbwidth	164
hideuserprofileinfo	put_empty
boxghostmessage	0
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debug	0
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popthankscount	5
mod_see_deleted	0
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listcat_show_moderators	1
lightbox	1
show_list_time	720
show_session_type	2
show_session_starttime	1800
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userlist_count_users	1
enable_threaded_layouts	0
category_subscriptions	post
topic_subscriptions	every
pubprofile	0
thankyou_max	10
email_recipient_count	0
email_recipient_privacy	bcc
captcha_post_limit	0
image_upload	registered
file_upload	registered
topic_layout	flat
time_to_create_page	1
show_imgfiles_manage_profile	1
hold_newusers_posts	0
hold_guest_posts	0
attachment_limit	16
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avatarresizemethod	1
avatarcrop	0
user_report	1
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attach_start	0
attach_end	14
attachment_utf8	1
autoembedsoundcloud	1
emailheader	media/kunena/email/hero-wide.png
user_status	1
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social	1
plain_email	0
moderator_permdelete	0
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smartlinking	0
defaultavatar	nophoto.png
defaultavatarsmall	s_nophoto.png
quickreply	1
avataredit	0
activemenuitem
mainmenu_id
home_id
index_id
moderators_id
topiclist_id
misc_id
profile_id
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avatar_type	1
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enablepdf	1
jmambot	0
annmodid	62
changename	0
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userlist_username	1
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usernamechange	1
rules_infb	1
help_infb	1
sefutf8	1
onlineusers	1
version_check	1
recaptcha_publickey
recaptcha_privatekey
recaptcha_theme	white

| Kunena integration settings:

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Kunena - Finder Disabled
Kunena - AltaUserPoints Disabled
Kunena - Community Builder Enabled: access=1 login=1 activity=1 avatar=1 profile=1 private=1
Kunena - Easyblog Disabled
Kunena - Easyprofile Disabled
Kunena - Easysocial Disabled
Kunena - Gravatar Disabled
Kunena - JomSocial Enabled: access=1 login=1 activity=1 avatar=1 profile=1 private=1 activity_points_limit=0 activity_stream_limit=0
Kunena - Joomla Enabled: access=1 login=1
Kunena - Kunena Enabled: avatar=1 profile=1
Kunena - UddeIM Disabled

| Joomla! detailed language files installed:

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Joomla! languages installed:
en-GB	English (en-GB)
de-DE	German (DE)

Third-party components: None

Third-party SEF components: None

Plugins: None

Modules: None