Thank you for the answers, no it works I deleted the post for the member 6 manually in the DB and everything is ok now ! I think it is more a question of bad timing and an unexpected error because I was unable to reproduce the same error again !

Thanks you, now I have others questions in new topics !!

It'll be hard to track down what happend in your case...

Actually Ossn has many in-built mechanisms which recursively delete all items which are chained to each other if the one element gets deleted.
Thus, deleting a member from the admin panel normally would delete all postings, comments, images, etc. of that member, too. And currently I have no idea what went wrong with member No. 6.

Maybe there's a chance to ask your co-admin if he remembers what steps he exactly did from creating the member until deleting?

No and I am very surprised !! It doesn't exist in mySQL database. An other admin create a profile and posted something, and deleted his profile via the admin panel of OSS.

Will it bug when everybody will delete their profile after they posted something ?

Another thing : I activated DisableSignup component few hours and I suspected he succeeded to create his profile during that moment, maybe it is linked ?

Thank you.
So please use your provider's PHPMyAdmin tool
and check the table named ossn_users
The column guid is representing the member ids. Is the member with guid 6 existing?

Besides all that: Please disable all add on components and switch back to the goblue theme.

The new error report :

[22-Jun-2017 16:03:55 Europe/Paris] post owner: 6
[22-Jun-2017 16:03:55 Europe/Paris] PHP Fatal error: Call to a member function profileURL() on boolean in /home///components/OssnWall/plugins/default/wall/templates/wall/user/item.php on line 42

• This is the last version : 4.4
• I didn't delete any user since it's a new installation and I just test it with few users.
• These are my system-info ! Do you see something ?

Thank you for your help !

Ossn System Info

Server Environment

Operating System Linux webd371.90.ha.ovh.net 4.4.67-ovh-vps-grsec-zfs-classid #1 SMP Thu May 11 18:47:35 CEST 2017 x86_64
PHP Environment

Version 5.6.30
Server APi fpm-fcgi
display_errors off

memorylimit 512M
registerglobals
postmaxsize 64M
uploadmaxfilesize 128M
default_charset UTF-8
MySQL Environment

Server Info 5.5.55-0+deb7u1-log
Host Info ***.mysql.db via TCP/IP
Protocol Version 10
Ossn Environment

Version 4.4
Site URL http://***
Install Dir /home///
Install Dir Owner [Perms] *** [0705]
Data Dir /home//_data/
Data Dir Owner [Perms] *** [0705]
Site Notification Email ***
Cache State 0
Members 8
Error Reporting off
Ossn Components

Component Active Checksum
OssnProfile 1 4dbc06ea92a10a55016cdaebbc0a5d02
OssnWall 1 5be86824357b61e84dd10c40c7aae71c
OssnComments 1 2d1f0c17f57eda06944271dc4840c29f
OssnLikes 1 b9efd0379629cdd2a0988131cbc13d4e
OssnPhotos 1 302e74705c7a70a2bb83b2920ed59c22
OssnNotifications 1 e07785d78a091ba27b14a0038928eee6
OssnSearch 1 4ebdbf51e113e245abf3b6dab30da5d5
OssnMessages 1 79939471915ef51101c11872c1342d3b
OssnAds 1 6bfbbcbb81dd6727fddf44b70415864f
OssnGroups 1 6f1941e1770967f2499ffc4a62d2d321
OssnSitePages 1 42cfdedb434c9acd5bec6a77223aa387
OssnBlock 1 3b5dffccf12827e52a217497e6245b5e
OssnChat 1 12625b89bc6c1e800972f967191b91c1
OssnPoke 1 1b2ca93ce77ab176bfecff8e19592bff
OssnInvite 1 2ee96ba8cd78a51fa6aaf61e1288762b
OssnEmbed 1 72f12a05af54e92deca6be5306930153
OssnSmilies 1 6651fb3b67d2f76d0af400b5a0d3f46b
signupfields 0 b6399d30e2a2a5e237f01c542a3aee85
aboutuser 0 c251789bb2d80b0f2b4990fe6754596a
userautovalidate 1 4deccc0d5070edd9632ffe381987057e
Blog 0 55fbc1b433d8763bbd03c24e9225ffac
footer-links 0 b5a6866d8d71f61fdc13e67a0599fed3
LatestMembers 1 1491d363ee24dd72b0415765d9691236
ReadMore 0 489b039a65c5f684effa5f4244d3946d
ProfanityFilter 0 3671d5b7d24e0889bf003bf8a7049cf3
Members 0 0b8da5058dff13d55b873c65754bb655
HelloWorld 0 584faeefb05de6c7d53905a973722071
ProfAccess 1 7ab1924fa9acefa2586a1f0b74ff9969
PrivateNetwork 1 8e60bca741f41e070a42fae943a93990
DisableSignup 0 43116c8c15c85c4cc8b66082758436ec
system-info 1 391f99e0fcc8d12da04889172fc60bfb
Ossn Themes

Theme Active Checksum
facebook 1 61e18169a51b7d92029349aed4087c3b
goblue 0 8b0bda5dddd2160a1f982cda855a9943
Ossn Core

Division Checksum
actions 7bd7e84a474d580fe4cba80509b9b01d
classes f6d986e6edbe92264ab2ec8909025c5e
libraries b4f6e35b3c9f28aead011377ca1dbff9
locale f20b4fbf80c814df03860ae3a3d09b0b
system ff69f0b1bf36a22c469cddf7ac2495e1
upgrade e87635f7c7e77c944905e128563ceec0
vendors b00fe05eb5302d596f66125f74d6d16d

Did you delete a member recently?
If so, did you delete the member from your admin panel or manually from the database?
Because it looks like the owner of a wall post no longer exists ...

As you have error logging already enabled, we can start checking the responsible member id like:

<?php error_log('post owner: ' . $params['post']->owner_guid); ?>

Please add that line right before line 41 of

components/OssnWall/plugins/default/wall/templates/wall/user/item.php

and provide new error log.

Please give us more information,
1. Which version you are using?
2. if you delete any user, how did you deleted it?
3. Please install this component : https://www.opensource-socialnetwork.org/component/view/1963/system-info and enable it from components page.

This is the result :

http://imgur.com/a/5HYsJ