Solved Can't access my categories

Forum down

I can't access my forum, even though I have all rights. Yesterday everything was fine. One of users just added a post. He reported to me that today he can't acces the topic. The same issue is with me - an admin. I'll add that I didn't do any operations on my joomla site in the time.

From backend when I go to the category manager it says:
You have orphaned or lost categories! Please change their parent to be a valid category.

When I try to enter / edit a category it says:
An error has occurred.
0 Call to a member function get() on string

When I press review button at a category it says:
Error
Duplicate entry '4' for key 'PRIMARY' SQL=INSERT INTO `#__kunena_categories` (`id`,`parent_id`,`name`,`alias`,`icon`,`icon_id`,`locked`,`accesstype`,`access`,`pub_access`,`pub_recurse`,`admin_access`,`admin_recurse`,`ordering`,`published`,`channels`,`checked_out`,`checked_out_time`,`review`,`allow_anonymous`,`post_anonymous`,`hits`,`description`,`headerdesc`,`class_sfx`,`allow_polls`,`topic_ordering`,`iconset`,`numTopics`,`numPosts`,`last_topic_id`,`last_post_id`,`last_post_time`,`params`) VALUES ('4','3','podtest2','podtest2','','0','0','joomla.level','1','1','1','8','1','1','0','THIS','0','0000-00-00 00:00:00','1','0','0','0','','','','0','lastpost','default','0','0','0','0','0','{\"display\":{\"index\":{\"parent\""3\",\"children\""3\"}}}')

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ID	Name	Menutype	Link	Path	In trash
141	Forum	kunenamenu	view=home&defaultmenu=143	forum	No
142	Index	kunenamenu	view=category&layout=list&catid=0	forum/index	No
143	Ostatnie tematy	kunenamenu	view=topics&mode=replies	forum/recent	No
144	Nowy temat	kunenamenu	view=topic&layout=create	forum/newtopic	No
145	No Replies	kunenamenu	view=topics&mode=noreplies	forum/noreplies	No
146	Moje tematy	kunenamenu	view=topics&layout=user&mode=default	forum/mylatest	No
147	Profil	kunenamenu	view=user	forum/profile	No
148	Pomoc	kunenamenu	view=misc	forum/help	No
149	Szukaj	kunenamenu	view=search	forum/search	No
150	Forum	mainmenu	Itemid=141	kunena-2016-03-17	No

Joomla default template details : Hobby2016 | author: | version: 1.0 | creationdate: 2016-03-27

Kunena default template details : Blue Eagle | author: Kunena Team | version: 4.0.10 | creationdate: 2016-02-18

Kunena version detailed: Kunena 4.0.10 | 2016-02-18 [ Villavicencio ]
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Hello,

PHP 7.0.x not work totally with Kunena 4.0.x, so i recommand to stick with PHP 5.6.x

Thank you, OK, I read something about it on this forum, but started the new thread as evething was working fine for few weeks. Do you think it will return to normal if I change php version? Or I I will need to make new categories? Or maybe new kunena 5 is compatible with php 7 and it's better solution? If you could refer to these doubts I'll really appreciate.

OK - all working fine after changing PHP to 5.6 Thanks once more!