Solved Error 500 after update to 4.0.8

Hello, as the subject says i am getting an 500 error after the update wenn trying to open topics after the update from 4.0.7 to 4.0,8.

The complete error after activating debug mode says "Fatal Error: Call to a member function get() on null in components/com_kunena/controller/category/topics/display.php on line 154"

I hope you can help me.

Here is my configuration:

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

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

This message contains confidential information

htaccess: Missing | PHP environment: Max execution time: 240 seconds | Max execution memory: 1536M | Max file upload: 100m

Kunena menu details:

Warning: Spoiler!

ID	Name	Menutype	Link	Path	In trash
101	Home	mainmenu	view=topics&mode=topics	home	No
136	Forum	mainmenu	Itemid=127	kunena-2015-11-01	No
127	Forum	kunenamenu	view=category&layout=list&catid=1	forum	No
128	Index	kunenamenu	view=category&layout=list	forum/index	No
129	Recent Topics	kunenamenu	view=topics&mode=replies	forum/recent	No
130	New Topic	kunenamenu	view=topic&layout=create	forum/newtopic	No
131	No Replies	kunenamenu	view=topics&mode=noreplies	forum/noreplies	No
132	My Topics	kunenamenu	view=topics&layout=user&mode=default	forum/mylatest	No
133	Profile	kunenamenu	view=user	forum/profile	No
134	Help	kunenamenu	view=misc	forum/help	No
135	Search	kunenamenu	view=search	forum/search	No

Joomla default template details : jPeople | author: xs | version: 1.0.0 | creationdate: 19-10-2015

Kunena default template details : Crypsis | author: Kunena Team | version: 4.0.8 | creationdate: 2016-01-12

Kunena version detailed: Kunena 4.0.8 | 2016-01-12 [ Tokyo ]
| Kunena detailed configuration:

Warning: Spoiler!

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
regonly	0
pubwrite	0
floodprotection	0
mailmod	0
mailadmin	-1
captcha	0
mailfull	1
allowavatarupload	1
allowavatargallery	1
avatarquality	75
avatarsize	2048
imageheight	800
imagewidth	800
imagesize	150
filetypes	txt,rtf,pdf,zip,tar.gz,tgz,tar.bz2
filesize	120
showranking	1
rankimages	1
userlist_rows	30
userlist_online	1
userlist_avatar	1
userlist_posts	1
userlist_karma	1
userlist_email	0
userlist_joindate	1
userlist_lastvisitdate	1
userlist_userhits	1
latestcategory	4,5,9,6,7,8,10,11,12
showstats	0
showwhoisonline	0
showgenstats	0
showpopuserstats	0
popusercount	5
showpopsubjectstats	1
popsubjectcount	5
showspoilertag	1
showvideotag	1
showebaytag	1
trimlongurls	1
trimlongurlsfront	40
trimlongurlsback	20
autoembedyoutube	1
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
rss_allow_html	1
rss_author_format	name
rss_author_in_title	1
rss_word_count	0
rss_old_titles	1
rss_cache	900
defaultpage	recent
default_sort	asc
sef	1
showimgforguest	1
showfileforguest	1
pollnboptions	4
pollallowvoteone	1
pollenabled	1
poppollscount	5
showpoppollstats	1
polltimebtvotes	00:15:00
pollnbvotesbyuser	100
pollresultsuserslist	1
maxpersotext	50
ordering_system	mesid
post_dateformat	ago
post_dateformat_hover	datetime
hide_ip	1
imagetypes	jpg,jpeg,gif,png
checkmimetypes	1
imagemimetypes	image/jpeg,image/jpg,image/gif,image/png
imagequality	50
thumbheight	32
thumbwidth	32
hideuserprofileinfo	put_empty
boxghostmessage	0
userdeletetmessage	0
latestcategory_in	1
topicicons	1
debug	0
catsautosubscribed	0
showbannedreason	0
showthankyou	1
showpopthankyoustats	1
popthankscount	5
mod_see_deleted	0
bbcode_img_secure	text
listcat_show_moderators	1
lightbox	1
show_list_time	720
show_session_type	2
show_session_starttime	1800
userlist_allowed	1
userlist_count_users	1
enable_threaded_layouts	1
category_subscriptions	post
topic_subscriptions	every
pubprofile	0
thankyou_max	10
email_recipient_count	0
email_recipient_privacy	bcc
captcha_post_limit	0
keywords	0
userkeywords	0
image_upload	registered
file_upload	registered
topic_layout	flat
time_to_create_page	0
show_imgfiles_manage_profile	1
hold_newusers_posts	0
hold_guest_posts	0
attachment_limit	8
pickup_category	0
article_display	intro
send_emails	1
fallback_english	1
cache	1
cache_time	60
iptracking	0
rss_feedburner_url
autolink	1
access_component	1
statslink_allowed	1
superadmin_userlist	0
legacy_urls	1
attachment_protection	0
categoryicons	1
avatarresizemethod	1
avatarcrop	0
user_report	1
searchtime	365
teaser	0
ebay_language	0
twitter_consumer_key
twitter_consumer_secret
allow_change_subject	1
max_links	6

| Kunena integration settings:

Warning: Spoiler!

Kunena - AlphaUserPoints Disabled
Kunena - Community Builder Disabled
Kunena - Gravatar Disabled
Kunena - JomSocial Disabled
Kunena - Joomla Enabled: access=1 login=1
Kunena - Kunena Enabled: avatar=1 profile=1
Kunena - UddeIM Disabled

| Joomla! detailed language files installed:

Warning: Spoiler!

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

Third-party components: None

Third-party SEF components: None

Plugins: None

Modules: None

This error you get if you have a issue on the kunena menu.

Try to recreate menu: Backend - kunena - tools - menu manager - fix menu

Thank you for the quick answer it did fix my problem

Hi, I have the same problem:
What can i do?

My kunena is 5.0.1

first try the new version. Please update

My Kunena is the latest(5.0.1).

5.0.2 is the latest version

I updated, but it did not help.

Are you running 3rt party plugins for kunena

No. These are my components: screenshot.sh/n9mCEPGGocjM0