Creating default object from empty value – error

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Hello, since a couple of weeks I have this error when trying posting new stuff on wordpress:

Creating default object from empty value in /home/mhd-01/www.mysite.it/htdocs/wp-admin/includes/post.php on line xxx

I can assure that this site has been working nicely for almost 10 years, so I am sure I have changed nothing configuration-wise. I tried to enable debugging and this is the log output:

[23-Oct-2022 08:40:23 Europe/Rome] PHP Notice: load_plugin_textdomain was called with an argument that is <strong>deprecated</strong> since version 2.7 with no alternative available. in /home/mhd-01/www.mysite.org/htdocs/wp-includes/functions.php on line 2724
[23-Oct-2022 08:40:23 Europe/Rome] PHP Notice: Undefined index: page in /home/mhd-01/www.mysite.org/htdocs/wp-content/plugins/gallery-plugin/gallery-plugin.php on line 1027
[23-Oct-2022 08:40:23 Europe/Rome] PHP Notice: load_plugin_textdomain was called with an argument that is <strong>deprecated</strong> since version 2.7 with no alternative available. in /home/mhd-01/www.mysite.org/htdocs/wp-includes/functions.php on line 2724
[23-Oct-2022 08:40:25 Europe/Rome] PHP Notice: load_plugin_textdomain was called with an argument that is <strong>deprecated</strong> since version 2.7 with no alternative available. in /home/mhd-01/www.mysite.org/htdocs/wp-includes/functions.php on line 2724
[23-Oct-2022 08:40:26 Europe/Rome] WordPress database error Incorrect datetime value: ‘0000-00-00 00:00:00’ for column ‘post_date_gmt’ at row 1 for query INSERT INTO `wp_posts` (`post_author`,`post_date`,`post_date_gmt`,`post_content`,`post_content_filtered`,`post_title`,`post_excerpt`,`post_status`,`post_type`,`comment_status`,`ping_status`,`post_password`,`post_name`,`to_ping`,`pinged`,`post_modified`,`post_modified_gmt`,`post_parent`,`menu_order`,`guid`) VALUES (1,’2022-10-23 08:40:26′,’0000-00-00 00:00:00′,”,”,’Auto Draft’,”,’auto-draft’,’post’,’open’,’open’,”,”,”,”,’2022-10-23 08:40:26′,’0000-00-00 00:00:00′,0,0,”) made by get_default_post_to_edit, wp_insert_post
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Trying to get property of non-object in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/post.php on line 422
[23-Oct-2022 08:40:26 Europe/Rome] PHP Warning: Creating default object from empty value in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/post.php on line 444
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$ID in /home/mhd-01/www.mysite.org/htdocs/wp-admin/post-new.php on line 50
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_date in /home/mhd-01/www.mysite.org/htdocs/wp-admin/edit-form-advanced.php on line 46
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_date in /home/mhd-01/www.mysite.org/htdocs/wp-admin/edit-form-advanced.php on line 59
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_status in /home/mhd-01/www.mysite.org/htdocs/wp-admin/edit-form-advanced.php on line 76
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$ID in /home/mhd-01/www.mysite.org/htdocs/wp-includes/post.php on line 4777
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$ID in /home/mhd-01/www.mysite.org/htdocs/wp-includes/post.php on line 4778
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_status in /home/mhd-01/www.mysite.org/htdocs/wp-admin/edit-form-advanced.php on line 143
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_status in /home/mhd-01/www.mysite.org/htdocs/wp-admin/edit-form-advanced.php on line 143
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_status in /home/mhd-01/www.mysite.org/htdocs/wp-admin/edit-form-advanced.php on line 146
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined index: page in /home/mhd-01/www.mysite.org/htdocs/wp-content/plugins/gallery-plugin/gallery-plugin.php on line 1027
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_author in /home/mhd-01/www.mysite.org/htdocs/wp-admin/edit-form-advanced.php on line 260
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_status in /home/mhd-01/www.mysite.org/htdocs/wp-admin/edit-form-advanced.php on line 262
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_status in /home/mhd-01/www.mysite.org/htdocs/wp-admin/edit-form-advanced.php on line 268
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$ID in /home/mhd-01/www.mysite.org/htdocs/wp-admin/edit-form-advanced.php on line 290
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$ID in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/post.php on line 1081
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$ID in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/post.php on line 1014
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_status in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/post.php on line 1083
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$ID in /home/mhd-01/www.mysite.org/htdocs/wp-admin/edit-form-advanced.php on line 291
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$ID in /home/mhd-01/www.mysite.org/htdocs/wp-includes/link-template.php on line 2335
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_status in /home/mhd-01/www.mysite.org/htdocs/wp-admin/edit-form-advanced.php on line 295
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_type in /home/mhd-01/www.mysite.org/htdocs/wp-includes/class-wp-editor.php on line 373
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_status in /home/mhd-01/www.mysite.org/htdocs/wp-admin/edit-form-advanced.php on line 322
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_modified in /home/mhd-01/www.mysite.org/htdocs/wp-admin/edit-form-advanced.php on line 328
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_modified in /home/mhd-01/www.mysite.org/htdocs/wp-admin/edit-form-advanced.php on line 328
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_type in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/meta-boxes.php on line 15
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Trying to get property of non-object in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/meta-boxes.php on line 17
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Trying to get property of non-object in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/meta-boxes.php on line 17
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_status in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/meta-boxes.php on line 30
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_status in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/meta-boxes.php on line 30
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_status in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/meta-boxes.php on line 30
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_status in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/meta-boxes.php on line 31
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Trying to get property of non-object in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/meta-boxes.php on line 37
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_status in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/meta-boxes.php on line 63
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_status in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/meta-boxes.php on line 83
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_status in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/meta-boxes.php on line 83
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_status in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/meta-boxes.php on line 113
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$ID in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/meta-boxes.php on line 158
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$ID in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/meta-boxes.php on line 194
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_type in /home/mhd-01/www.mysite.org/htdocs/wp-includes/capabilities.php on line 966
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_type in /home/mhd-01/www.mysite.org/htdocs/wp-includes/capabilities.php on line 970
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Trying to get property of non-object in /home/mhd-01/www.mysite.org/htdocs/wp-includes/capabilities.php on line 972
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Trying to get property of non-object in /home/mhd-01/www.mysite.org/htdocs/wp-includes/capabilities.php on line 973
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Trying to get property of non-object in /home/mhd-01/www.mysite.org/htdocs/wp-includes/capabilities.php on line 973
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Trying to get property of non-object in /home/mhd-01/www.mysite.org/htdocs/wp-includes/capabilities.php on line 976
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Trying to get property of non-object in /home/mhd-01/www.mysite.org/htdocs/wp-includes/capabilities.php on line 976
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_status in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/meta-boxes.php on line 207
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_type in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/meta-boxes.php on line 242
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$ID in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/meta-boxes.php on line 339
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$ID in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/meta-boxes.php on line 285
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$ID in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/meta-boxes.php on line 917
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$ID in /home/mhd-01/www.mysite.org/htdocs/wp-admin/includes/meta-boxes.php on line 421
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_status in /home/mhd-01/www.mysite.org/htdocs/wp-includes/class-wp-editor.php on line 670
[23-Oct-2022 08:40:26 Europe/Rome] PHP Notice: Undefined property: stdClass::$post_type in /home/mhd-01/www.mysite.org/htdocs/wp-includes/class-wp-editor.php on line 680
[23-Oct-2022 08:40:27 Europe/Rome] PHP Notice: load_plugin_textdomain was called with an argument that is <strong>deprecated</strong> since version 2.7 with no alternative available. in /home/mhd-01/www.mysite.org/htdocs/wp-includes/functions.php on line 2724

Can someone help me understand what these errors mean? Thanks!

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