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Failed to load resource: the server responded with a status of 500 (Internal Server Error)
mysite.com/kunena/topic/edit.raw

Hello,

That's means that you have a Php error which cause this, you can look in your error log of your hosting or server if you find something or in kunena logs in backend if you had enabled it

I enabled error reporting in Joomla at maximal level and got this message:
Notice: Trying to access array offset on value of type bool in libraries/kunena/forum/message/message.php on line 333
No message from my web host error log.

Are-you using Php 7.4.x ? Else which version of Php ?

I will look at this to fix this issue

I am using PHP 7.4.6

Hello,

We have tried to reproduce this issue with Php 7.4 but we aren't not able to repeduce it. Can-you post here your Kunena configuration settings, please ?

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: 30 seconds | Max execution memory: 128M | Max file upload: 32M

Kunena menu details:

Warning: Spoiler!

ID	Name	Menutype	Link	Path	In trash
1612	Forum	menymob	view=home&defaultmenu=1601	kunena2	No
1601	Forum	kunenamenu	view=home&defaultmenu=1610	kunena	No
1602	Index	kunenamenu	view=category&layout=list&catid=0	kunena/index	No
1603	Senaste ämnen	kunenamenu	view=topics&mode=replies	kunena/recent	No
1604	Nytt ämne	kunenamenu	view=topic&layout=create	kunena/newtopic	No
1605	Inga svar	kunenamenu	view=topics&mode=noreplies	kunena/noreplies	No
1606	Mina ämnen	kunenamenu	view=topics&layout=user&mode=default	kunena/mylatest	No
1607	Profil	kunenamenu	view=user	kunena/profile	No
1608	Hjälp	kunenamenu	view=misc	kunena/help	No
1609	Sök	kunenamenu	view=search	kunena/search	No
1610	Forum	mainmenu	view=home&defaultmenu=1601	kunena1	No
2625	Forumsök	mainmenu	view=search	sok-m-m/forumsok	No

Joomla default template details : g5_hydrogen | author: RocketTheme, LLC | version: 5.4.34 | creationdate: April 30, 2020

Kunena default template details : Crypsis | author: Kunena Team | version: 5.1.19 | creationdate: 2020-08-15

Kunena template params:

Warning: Spoiler!

DefaultCategoryicon
profileIconset	default
DefaultIconset	default
editorIconset	default
bootstrap	1
icomoon	1
tooltips	1
borderless	1
SubjectLengthMessage	80
fullactions	1
quick	2
displayMenu	1
displayDropdownMenu	1
displayDropdownContent	1
displayModule	1
displayBreadcrumb	0
displayAnnouncement	1
displayFooter	1
avatarPosition	left
avatarType	img-circle
labels	0
whoisonlineName	default
formRecover	0
topicicontype	fa
fontawesome	1
socialshare	0
socialsharetag
socialtheme	classic
optional_username	0
writeaccess	0
localstorage	0
IconColor	inherit
IconColorNew	#48a348
editor	0
video	1
maps	0
emoticons	1
twitter	1
ebay	0
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 5.1.19 | 2020-08-15 [ Tethys ]
| Kunena detailed configuration:

Warning: Spoiler!

Kunena config settings:
board_offline	0
enablerss	1
threads_per_page	20
messages_per_page	8
messages_per_page_search	15
showhistory	1
historylimit	6
shownew	1
disemoticons	0
template	crypsis
showannouncement	1
avataroncat	1
catimagepath	category_images
showchildcaticon	1
rtewidth	450
rteheight	300
enableforumjump	1
reportmsg	1
username	1
askemail	0
showemail	0
showuserstats	1
showkarma	0
useredit	1
useredittime	0
useredittimegrace	1600
editmarkup	1
allowsubscriptions	1
subscriptionschecked	1
allowfavorites	0
maxsubject	50
maxsig	300
regonly	0
pubwrite	0
floodprotection	60
mailmod	-1
mailadmin	-1
captcha	1
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	0
userlist_email	0
userlist_joindate	1
userlist_lastvisitdate	1
userlist_userhits	1
latestcategory	0
showstats	1
showwhoisonline	1
showgenstats	1
showpopuserstats	0
popusercount	5
showpopsubjectstats	0
popsubjectcount	5
showspoilertag	0
showvideotag	1
showebaytag	0
trimlongurls	1
trimlongurlsfront	40
trimlongurlsback	20
autoembedyoutube	1
autoembedebay	0
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	100
rss_old_titles	1
rss_cache	900
defaultpage	recent
default_sort	asc
sef	1
showimgforguest	1
showfileforguest	1
pollnboptions	9
pollallowvoteone	1
pollenabled	1
poppollscount	5
showpoppollstats	0
polltimebtvotes	00:15:00
pollnbvotesbyuser	100
pollresultsuserslist	0
allow_user_edit_poll	0
maxpersotext	50
ordering_system	mesid
post_dateformat	datetime_today
post_dateformat_hover	datetime
hide_ip	1
imagetypes	jpg,jpeg,gif,png,bmp
checkmimetypes	1
imagemimetypes	image/jpeg,image/jpg,image/gif,image/png
imagequality	50
thumbheight	32
thumbwidth	32
hideuserprofileinfo	put_empty
boxghostmessage	1
userdeletetmessage	0
latestcategory_in	1
topicicons	0
debug	0
catsautosubscribed	0
showbannedreason	0
showthankyou	0
showpopthankyoustats	0
popthankscount	5
mod_see_deleted	1
bbcode_img_secure	text
listcat_show_moderators	0
lightbox	1
show_list_time	720
show_session_type	2
show_session_starttime	1800
userlist_allowed	0
userlist_count_users	1
enable_threaded_layouts	0
category_subscriptions	topic
topic_subscriptions	first
pubprofile	0
thankyou_max	10
email_recipient_count	100
email_recipient_privacy	bcc
captcha_post_limit	0
image_upload	moderator
file_upload	moderator
topic_layout	flat
time_to_create_page	1
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	0
cache_time	60
iptracking	1
rss_feedburner_url
autolink	1
access_component	1
statslink_allowed	1
superadmin_userlist	1
legacy_urls	0
attachment_protection	1
categoryicons	1
avatarresizemethod	2
avatarcrop	1
user_report	1
searchtime	all
teaser	0
ebay_language	0
allow_change_subject	1
max_links	6
read_only	0
ratingenabled	0
url_subject_topic	0
log_moderation	1
attach_start	0
attach_end	14
attachment_utf8	1
autoembedsoundcloud	0
emailheader	/media/kunena/email/hero-wide.png
user_status	1
signature	1
personal	1
social	1
plain_email	0
moderator_permdelete	1
avatartypes	gif, jpeg, jpg, png
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
search_id
avatar_type	0
sef_redirect	1
allow_edit_poll	1
use_system_emails	0
autoembedinstagram	1
disable_re	1
email_sender_name
display_filename_attachment	0

| Kunena integration settings:

Warning: Spoiler!

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:

Warning: Spoiler!

Joomla! languages installed:
en-GB	English (United Kingdom)
nb-NO	Norwegian bokmål (nb-NO)
sv-SE	Swedish (Sweden)
nn-NO	Nynorsk (New Norwegian)

Third-party components: UddeIM 4.0

Third-party SEF components: None

Plugins: None

Modules: Kunena Latest 5.1.2 | Kunena Login 5.1.2

On PHP 7.4.1 with Xampp it did work, but not with PHP 7.4.9 Xampp.

These changes should fix the notices not sure if it will fix the internal error with preview : github.com/xillibit/Kunena-forum/commit/...c7c00bb04fd94479517b

I tried that fix, but got the error 0 Class 'IpHelper' not found even after upgrade to 3.9.21.

Hello,

I think you have forgot to put at the begining of /kunena/forum/message/message.php the following line (at line 16) :