php 5.6+: featured profile collab community fails: "An error occurred: Column 'user' cannot be null"

• Error
• Regression

See below;

root@penguinbookpro:/var/www/html/12.x# php console.php d:i --force; php console.php p:a Collaborative_Community_12x
Installation completed.
Queries executed successfully: 1374
PHP Notice:  Undefined index: country in /var/www/html/12.x/lib/core/Search/ContentSource/UserSource.php on line 56
PHP Deprecated:  iconv_set_encoding(): Use of iconv.internal_encoding is deprecated in /var/www/html/12.x/vendor/bombayworks/zendframework1/library/Zend/Validate/Hostname.php on line 553
PHP Deprecated:  iconv_set_encoding(): Use of iconv.internal_encoding is deprecated in /var/www/html/12.x/vendor/bombayworks/zendframework1/library/Zend/Validate/Hostname.php on line 649
PHP Deprecated:  iconv_set_encoding(): Use of iconv.internal_encoding is deprecated in /var/www/html/12.x/vendor/bombayworks/zendframework1/library/Zend/Validate/Hostname.php on line 553
PHP Deprecated:  iconv_set_encoding(): Use of iconv.internal_encoding is deprecated in /var/www/html/12.x/vendor/bombayworks/zendframework1/library/Zend/Validate/Hostname.php on line 649
PHP Deprecated:  iconv_set_encoding(): Use of iconv.internal_encoding is deprecated in /var/www/html/12.x/vendor/bombayworks/zendframework1/library/Zend/Validate/Hostname.php on line 553
PHP Deprecated:  iconv_set_encoding(): Use of iconv.internal_encoding is deprecated in /var/www/html/12.x/vendor/bombayworks/zendframework1/library/Zend/Validate/Hostname.php on line 649
PHP Deprecated:  iconv_set_encoding(): Use of iconv.internal_encoding is deprecated in /var/www/html/12.x/vendor/bombayworks/zendframework1/library/Zend/Validate/Hostname.php on line 553
PHP Deprecated:  iconv_set_encoding(): Use of iconv.internal_encoding is deprecated in /var/www/html/12.x/vendor/bombayworks/zendframework1/library/Zend/Validate/Hostname.php on line 649
PHP Deprecated:  iconv_set_encoding(): Use of iconv.internal_encoding is deprecated in /var/www/html/12.x/vendor/bombayworks/zendframework1/library/Zend/Validate/Hostname.php on line 553
PHP Deprecated:  iconv_set_encoding(): Use of iconv.internal_encoding is deprecated in /var/www/html/12.x/vendor/bombayworks/zendframework1/library/Zend/Validate/Hostname.php on line 649
PHP Deprecated:  iconv_set_encoding(): Use of iconv.internal_encoding is deprecated in /var/www/html/12.x/vendor/bombayworks/zendframework1/library/Zend/Validate/Hostname.php on line 553
PHP Deprecated:  iconv_set_encoding(): Use of iconv.internal_encoding is deprecated in /var/www/html/12.x/vendor/bombayworks/zendframework1/library/Zend/Validate/Hostname.php on line 649
PHP Notice:  Undefined index: mail in /var/www/html/12.x/lib/core/Tiki/Profile/InstallHandler/Forum.php on line 123
PHP Notice:  Undefined index: list_att_nb in /var/www/html/12.x/lib/core/Tiki/Profile/InstallHandler/Forum.php on line 169
PHP Notice:  Undefined index: outboundEmail in /var/www/html/12.x/lib/core/Tiki/Profile/InstallHandler/Tracker.php on line 141
PHP Warning:  PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'user' cannot be null in /var/www/html/12.x/lib/core/TikiDb/Pdo.php on line 75
Installation failed:
Applying profile: Collaborative_Community_12x
Preference set: sitetitle=Our community
Preference set: sitesubtitle=Log on, Learn, Share
Preference set: browsertitle=Community Wiki
Preference set: feature_top_bar=y
Preference set: feature_sitemenu=y
Preference set: allowRegister=y
Preference set: modseparateanon=y
Preference set: feature_modulecontrols=y
Preference set: users_prefs_user_information=public
Preference set: feature_community_mouseover=y
Preference set: users_prefs_show_mouseover_user_info=y
Preference set: feature_search_fulltext=y
Preference set: search_autocomplete=y
Preference set: useGroupHome=y
Preference set: limitedGoGroupHome=y
Preference set: feature_search=y
Preference set: feature_site_report=y
Preference set: feature_contact=y
Preference set: contact_anon=y
Preference set: feature_wiki_print=y
Preference set: feature_wiki_attachments=y
Preference set: wiki_auto_toc=y
Preference set: wikiplugin_proposal=y
Preference set: wikiplugininline_proposal=y
Preference set: wikiplugininline_remarksbox=y
Preference set: wikipluginprefs_pending_notification=y
Preference set: feature_wiki_comments=y
Preference set: comments_field_email=y
Preference set: comments_field_website=y
Preference set: feature_forums=y
Preference set: feature_forum_parse=y
Preference set: feature_user_watches=y
Preference set: feature_group_watches=y
Preference set: calendar_fullcalendar=y
Preference set: feature_trackers=y
Preference set: ajax_inline_edit=y
Preference set: tracker_change_field_type=y
Preference set: wikiplugin_trackercalendar=y
Preference set: trackerfield_dropdownother=y
Preference set: feature_calendar=y
Preference set: wikiplugin_convene=y
Added (or modified): module "since_last_visit_new"
Added (or modified): module "quick_edit"
Added (or modified): wiki_page "HomePage"
Added (or modified): wiki_page "Instructions"
Added (or modified): wiki_page "Community"
Added (or modified): wiki_page "Wiki Help"
Added (or modified): forum "Discussion forum"
Added (or modified): tracker "Tracker to show items through a calendar"
Added (or modified): tracker_field "Summary"
Added (or modified): tracker_field "Location"
Added (or modified): tracker_field "Priority"
Added (or modified): tracker_field "Description"
Added (or modified): tracker_field "Start date"
Added (or modified): tracker_field "End date"
Added (or modified): tracker_item "No name"
Added (or modified): tracker_item "No name"
Added (or modified): tracker_item "No name"
Added (or modified): tracker_item "No name"
Added (or modified): tracker_item "No name"
Added (or modified): tracker_item "No name"
Added (or modified): tracker_item "No name"
Added (or modified): tracker_item "No name"
Added (or modified): plugin_alias "event"
An error occurred: Column 'user' cannot be null

This bug has been demonstrated on show2.tikiwiki.org

Please demonstrate your bug on show2.tikiwiki.org