Changing page author in unpublished draft in composer results in error

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When adding a new page in composer mode, clearing the author field and selecting a new author, the second(!) next autosave XHR request results in a 500 server error and an access denied error popup (see attached screenshot).

If the page is first published and the author is changed in composer after that, everything works as expected.

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Status: New
Guido

concrete5 Environment Information

# concrete5 Version
Core Version - 8.4.0
Version Installed - 8.4.0
Database Version - 20180524000000

# concrete5 Packages
Backup Pro (3.3.0.8), Block Designer (3.1.0), Block Designer Pro (3.0.0), Editor Snippet (0.9), Font Awesome Font Icons for CKEditor (0.9.1), Multi Page Selector Attribute (0.9.1), Page Redirect (2.0), Page Selector Attribute (2.0)

# concrete5 Overrides
blocks/icon_carousel/composer.php, blocks/icon_carousel/css_form/repeatable-ft.form.css, blocks/icon_carousel/css_form, blocks/icon_carousel/add.php, blocks/icon_carousel/config.json, blocks/icon_carousel/controller.php, blocks/icon_carousel/view.php, blocks/icon_carousel/templates/about/view.php, blocks/icon_carousel/templates/about, blocks/icon_carousel/templates, blocks/icon_carousel/db.xml, blocks/icon_carousel/edit.php, blocks/icon_carousel/js_form/handlebars-helpers.js, blocks/icon_carousel/js_form/handlebars-v4.0.4.js, blocks/icon_carousel/js_form, blocks/icon_carousel/icon.png, blocks/icon_carousel/form.php, blocks/icon_carousel/auto.js, blocks/icon_carousel, blocks/trending/composer.php, blocks/trending/css_form/repeatable-ft.form.css, blocks/trending/css_form, blocks/trending/add.php, blocks/trending/config.json, blocks/trending/controller.php, blocks/trending/view.php, blocks/trending/db.xml, blocks/trending/edit.php, blocks/trending/js_form/handlebars-helpers.js, blocks/trending/js_form/handlebars-v4.0.4.js, blocks/trending/js_form, blocks/trending/icon.png, blocks/trending/form.php, blocks/trending/auto.js, blocks/trending, blocks/menu/composer.php, blocks/menu/css_form/repeatable-ft.form.css, blocks/menu/css_form, blocks/menu/add.php, blocks/menu/config.json, blocks/menu/controller.php, blocks/menu/view.php, blocks/menu/db.xml, blocks/menu/edit.php, blocks/menu/js_form/handlebars-helpers.js, blocks/menu/js_form/handlebars-v4.0.4.js, blocks/menu/js_form, blocks/menu/icon.png, blocks/menu/form.php, blocks/menu/auto.js, blocks/menu, blocks/quote/composer.php, blocks/quote/add.php, blocks/quote/config.json, blocks/quote/controller.php, blocks/quote/view.php, blocks/quote/templates/teammember_left/view.php, blocks/quote/templates/teammember_left, blocks/quote/templates/teammember_right/view.php, blocks/quote/templates/teammember_right, blocks/quote/templates, blocks/quote/db.xml, blocks/quote/edit.php, blocks/quote/icon.png, blocks/quote/form.php, blocks/quote, blocks/page_selector/composer.php, blocks/page_selector/add.php, blocks/page_selector/config.json, blocks/page_selector/controller.php, blocks/page_selector/view.php, blocks/page_selector/templates/products/view.php, blocks/page_selector/templates/products, blocks/page_selector/templates/trending_filters/view.php, blocks/page_selector/templates/trending_filters, blocks/page_selector/templates/jobs/view.php, blocks/page_selector/templates/jobs, blocks/page_selector/templates/homepage_menu/view.php, blocks/page_selector/templates/homepage_menu, blocks/page_selector/templates/latest_article/view.php, blocks/page_selector/templates/latest_article, blocks/page_selector/templates, blocks/page_selector/db.xml, blocks/page_selector/edit.php, blocks/page_selector/icon.png, blocks/page_selector/form.php, blocks/page_selector, blocks/accordion/composer.php, blocks/accordion/css_form/repeatable-ft.form.css, blocks/accordion/css_form, blocks/accordion/add.php, blocks/accordion/config.json, blocks/accordion/controller.php, blocks/accordion/view.php, blocks/accordion/db.xml, blocks/accordion/edit.php, blocks/accordion/js_form/handlebars-helpers.js, blocks/accordion/js_form/handlebars-v4.0.4.js, blocks/accordion/js_form, blocks/accordion/icon.png, blocks/accordion/form.php, blocks/accordion/auto.js, blocks/accordion, blocks/download/composer.php, blocks/download/add.php, blocks/download/config.json, blocks/download/controller.php, blocks/download/view.php, blocks/download/db.xml, blocks/download/edit.php, blocks/download/icon.png, blocks/download/form.php, blocks/download/auto.js, blocks/download, blocks/articles/composer.php, blocks/articles/css_form/repeatable-ft.form.css, blocks/articles/css_form, blocks/articles/add.php, blocks/articles/config.json, blocks/articles/controller.php, blocks/articles/view.php, blocks/articles/db.xml, blocks/articles/edit.php, blocks/articles/js_form/handlebars-helpers.js, blocks/articles/js_form/handlebars-v4.0.4.js, blocks/articles/js_form, blocks/articles/icon.png, blocks/articles/form.php, blocks/articles/auto.js, blocks/articles, blocks/manual_nav/composer.php, blocks/manual_nav/css_form/repeatable-ft.form.css, blocks/manual_nav/css_form, blocks/manual_nav/add.php, blocks/manual_nav/config.json, blocks/manual_nav/controller.php, blocks/manual_nav/view.php, blocks/manual_nav/templates/footer/view.php, blocks/manual_nav/templates/footer, blocks/manual_nav/templates/secondary/view.php, blocks/manual_nav/templates/secondary, blocks/manual_nav/templates, blocks/manual_nav/db.xml, blocks/manual_nav/edit.php, blocks/manual_nav/js_form/handlebars-helpers.js, blocks/manual_nav/js_form/handlebars-v4.0.4.js, blocks/manual_nav/js_form, blocks/manual_nav/icon.png, blocks/manual_nav/form.php, blocks/manual_nav/auto.js, blocks/manual_nav, blocks/simple_image/composer.php, blocks/simple_image/add.php, blocks/simple_image/config.json, blocks/simple_image/controller.php, blocks/simple_image/view.php, blocks/simple_image/templates/profile_image/view.php, blocks/simple_image/templates/profile_image, blocks/simple_image/templates, blocks/simple_image/db.xml, blocks/simple_image/edit.php, blocks/simple_image/icon.png, blocks/simple_image/form.php, blocks/simple_image, blocks/faq_items/composer.php, blocks/faq_items/css_form/repeatable-ft.form.css, blocks/faq_items/css_form, blocks/faq_items/add.php, blocks/faq_items/config.json, blocks/faq_items/controller.php, blocks/faq_items/view.php, blocks/faq_items/db.xml, blocks/faq_items/edit.php, blocks/faq_items/js_form/handlebars-helpers.js, blocks/faq_items/js_form/handlebars-v4.0.4.js, blocks/faq_items/js_form, blocks/faq_items/icon.png, blocks/faq_items/form.php, blocks/faq_items/auto.js, blocks/faq_items, blocks/usp_items/composer.php, blocks/usp_items/css_form/repeatable-ft.form.css, blocks/usp_items/css_form, blocks/usp_items/add.php, blocks/usp_items/config.json, blocks/usp_items/controller.php, blocks/usp_items/view.php, blocks/usp_items/templates/product/view.php, blocks/usp_items/templates/product, blocks/usp_items/templates/custom/view.php, blocks/usp_items/templates/custom, blocks/usp_items/templates, blocks/usp_items/db.xml, blocks/usp_items/edit.php, blocks/usp_items/js_form/handlebars-helpers.js, blocks/usp_items/js_form/handlebars-v4.0.4.js, blocks/usp_items/js_form, blocks/usp_items/icon.png, blocks/usp_items/form.php, blocks/usp_items/auto.js, blocks/usp_items, blocks/simple_quote/composer.php, blocks/simple_quote/add.php, blocks/simple_quote/config.json, blocks/simple_quote/controller.php, blocks/simple_quote/view.php, blocks/simple_quote/db.xml, blocks/simple_quote/edit.php, blocks/simple_quote/icon.png, blocks/simple_quote/form.php, blocks/simple_quote, blocks/download_form/composer.php, blocks/download_form/add.php, blocks/download_form/config.json, blocks/download_form/controller.php, blocks/download_form/view.php, blocks/download_form/db.xml, blocks/download_form/edit.php, blocks/download_form/icon.png, blocks/download_form/form.php, blocks/download_form, blocks/autonav/templates/breadcrumb.php, blocks/autonav/templates, blocks/autonav, blocks/statistics/composer.php, blocks/statistics/css_form/repeatable-ft.form.css, blocks/statistics/css_form, blocks/statistics/add.php, blocks/statistics/config.json, blocks/statistics/controller.php, blocks/statistics/view.php, blocks/statistics/db.xml, blocks/statistics/edit.php, blocks/statistics/js_form/handlebars-helpers.js, blocks/statistics/js_form/handlebars-v4.0.4.js, blocks/statistics/js_form, blocks/statistics/icon.png, blocks/statistics/form.php, blocks/statistics/auto.js, blocks/statistics, blocks/text_and_image/composer.php, blocks/text_and_image/add.php, blocks/text_and_image/config.json, blocks/text_and_image/controller.php, blocks/text_and_image/view.php, blocks/text_and_image/templates/full/view.php, blocks/text_and_image/templates/full, blocks/text_and_image/templates/full_with_small_text/view.php, blocks/text_and_image/templates/full_with_small_text, blocks/text_and_image/templates, blocks/text_and_image/db.xml, blocks/text_and_image/edit.php, blocks/text_and_image/icon.png, blocks/text_and_image/form.php, blocks/text_and_image, blocks/quotes/composer.php, blocks/quotes/css_form/repeatable-ft.form.css, blocks/quotes/css_form, blocks/quotes/add.php, blocks/quotes/config.json, blocks/quotes/controller.php, blocks/quotes/view.php, blocks/quotes/db.xml, blocks/quotes/edit.php, blocks/quotes/js_form/handlebars-helpers.js, blocks/quotes/js_form/handlebars-v4.0.4.js, blocks/quotes/js_form, blocks/quotes/icon.png, blocks/quotes/form.php, blocks/quotes/auto.js, blocks/quotes, blocks/quotes_slideshow/composer.php, blocks/quotes_slideshow/css_form/repeatable-ft.form.css, blocks/quotes_slideshow/css_form, blocks/quotes_slideshow/add.php, blocks/quotes_slideshow/config.json, blocks/quotes_slideshow/controller.php, blocks/quotes_slideshow/view.php, blocks/quotes_slideshow/db.xml, blocks/quotes_slideshow/edit.php, blocks/quotes_slideshow/js_form/handlebars-helpers.js, blocks/quotes_slideshow/js_form/handlebars-v4.0.4.js, blocks/quotes_slideshow/js_form, blocks/quotes_slideshow/icon.png, blocks/quotes_slideshow/form.php, blocks/quotes_slideshow/auto.js, blocks/quotes_slideshow, blocks/jobs/composer.php, blocks/jobs/css_form/repeatable-ft.form.css, blocks/jobs/css_form, blocks/jobs/add.php, blocks/jobs/config.json, blocks/jobs/controller.php, blocks/jobs/view.php, blocks/jobs/db.xml, blocks/jobs/edit.php, blocks/jobs/js_form/handlebars-helpers.js, blocks/jobs/js_form/handlebars-v4.0.4.js, blocks/jobs/js_form, blocks/jobs/icon.png, blocks/jobs/form.php, blocks/jobs/auto.js, blocks/jobs, blocks/download_leaflet/composer.php, blocks/download_leaflet/add.php, blocks/download_leaflet/config.json, blocks/download_leaflet/controller.php, blocks/download_leaflet/view.php, blocks/download_leaflet/db.xml, blocks/download_leaflet/edit.php, blocks/download_leaflet/icon.png, blocks/download_leaflet/form.php, blocks/download_leaflet, blocks/content/view.php, blocks/content/templates/column/view.php, blocks/content/templates/column, blocks/content/templates/plain/view.php, blocks/content/templates/plain, blocks/content/templates, blocks/content, blocks/related_products/composer.php, blocks/related_products/css_form/repeatable-ft.form.css, blocks/related_products/css_form, blocks/related_products/add.php, blocks/related_products/config.json, blocks/related_products/controller.php, blocks/related_products/view.php, blocks/related_products/db.xml, blocks/related_products/edit.php, blocks/related_products/js_form/handlebars-helpers.js, blocks/related_products/js_form/handlebars-v4.0.4.js, blocks/related_products/js_form, blocks/related_products/icon.png, blocks/related_products/form.php, blocks/related_products/auto.js, blocks/related_products, blocks/excerpt/composer.php, blocks/excerpt/css_form/repeatable-ft.form.css, blocks/excerpt/css_form, blocks/excerpt/add.php, blocks/excerpt/config.json, blocks/excerpt/controller.php, blocks/excerpt/view.php, blocks/excerpt/templates/header/view.php, blocks/excerpt/templates/header, blocks/excerpt/templates/home_introduction/view.php, blocks/excerpt/templates/home_introduction, blocks/excerpt/templates/home_about/view.php, blocks/excerpt/templates/home_about, blocks/excerpt/templates/plain/view.php, blocks/excerpt/templates/plain, blocks/excerpt/templates, blocks/excerpt/db.xml, blocks/excerpt/edit.php, blocks/excerpt/js_form/handlebars-helpers.js, blocks/excerpt/js_form/handlebars-v4.0.4.js, blocks/excerpt/js_form, blocks/excerpt/icon.png, blocks/excerpt/form.php, blocks/excerpt/auto.js, blocks/excerpt, blocks/form/templates/job/view.php, blocks/form/templates/job, blocks/form/templates, blocks/form, blocks/checkmarks/composer.php, blocks/checkmarks/css_form/repeatable-ft.form.css, blocks/checkmarks/css_form, blocks/checkmarks/add.php, blocks/checkmarks/config.json, blocks/checkmarks/controller.php, blocks/checkmarks/view.php, blocks/checkmarks/db.xml, blocks/checkmarks/edit.php, blocks/checkmarks/js_form/handlebars-helpers.js, blocks/checkmarks/js_form/handlebars-v4.0.4.js, blocks/checkmarks/js_form, blocks/checkmarks/icon.png, blocks/checkmarks/form.php, blocks/checkmarks/auto.js, blocks/checkmarks, blocks/incentive/composer.php, blocks/incentive/css_form/repeatable-ft.form.css, blocks/incentive/css_form, blocks/incentive/add.php, blocks/incentive/config.json, blocks/incentive/controller.php, blocks/incentive/view.php, blocks/incentive/db.xml, blocks/incentive/edit.php, blocks/incentive/js_form/handlebars-helpers.js, blocks/incentive/js_form/handlebars-v4.0.4.js, blocks/incentive/js_form, blocks/incentive/icon.png, blocks/incentive/form.php, blocks/incentive/auto.js, blocks/incentive, controllers/page_types/team.php, controllers/page_types/article.php, controllers/page_types/job.php, controllers/page_types/trending.php, controllers/page_types/knowledge_base.php, controllers/page_types/product.php, controllers/page_types, jobs/vimeo.php, mail/check.php, themes/uniserver/assets/img/icons/icon_nl.png, themes/uniserver/assets/img/icons, themes/uniserver/assets/img/logos/companylogo.png, themes/uniserver/assets/img/logos/favicon.ico, themes/uniserver/assets/img/logos, themes/uniserver/assets/img/svg/icon-whatsapp.svg, themes/uniserver/assets/img/svg/icon-skill.svg, themes/uniserver/assets/img/svg/icon-clock.svg, themes/uniserver/assets/img/svg/icon-open.svg, themes/uniserver/assets/img/svg/icon-calendar.svg, themes/uniserver/assets/img/svg/icon-world.svg, themes/uniserver/assets/img/svg/icon-prev.svg, themes/uniserver/assets/img/svg/icon-pause.svg, themes/uniserver/assets/img/svg/icon-twitter.svg, themes/uniserver/assets/img/svg/icon-mail.svg, themes/uniserver/assets/img/svg/icon-call.svg, themes/uniserver/assets/img/svg/icon-close-cookie.svg, themes/uniserver/assets/img/svg/logo.svg, themes/uniserver/assets/img/svg/icon-next.svg, themes/uniserver/assets/img/svg/icon-breadcrumb.svg, themes/uniserver/assets/img/svg/icon_nl.svg, themes/uniserver/assets/img/svg/icon-close.svg, themes/uniserver/assets/img/svg/icon-checkmark.svg, themes/uniserver/assets/img/svg/icon-play.svg, themes/uniserver/assets/img/svg/icon-linkedin.svg, themes/uniserver/assets/img/svg/login.svg, themes/uniserver/assets/img/svg/icon-close-popup.svg, themes/uniserver/assets/img/svg, themes/uniserver/assets/img/placeholders/bg-blur.png, themes/uniserver/assets/img/placeholders/usp3-blue.png, themes/uniserver/assets/img/placeholders/usp1-orange.png, themes/uniserver/assets/img/placeholders/uniserver-nl.gif, themes/uniserver/assets/img/placeholders/placeholder-3.png, themes/uniserver/assets/img/placeholders/placeholder-1.png, themes/uniserver/assets/img/placeholders/usp3-orange.png, themes/uniserver/assets/img/placeholders/michiel.jpg, themes/uniserver/assets/img/placeholders/placeholder-2.png, themes/uniserver/assets/img/placeholders/usp1-blue.png, themes/uniserver/assets/img/placeholders/usp2-blue.png, themes/uniserver/assets/img/placeholders/uniserver-nl.svg, themes/uniserver/assets/img/placeholders/usp2-orange.png, themes/uniserver/assets/img/placeholders, themes/uniserver/assets/img, themes/uniserver/assets/js/vendor.js, themes/uniserver/assets/js/vendor.js.map, themes/uniserver/assets/js/main.js.map, themes/uniserver/assets/js/main.js, themes/uniserver/assets/js, themes/uniserver/assets/fonts/GT-America-Trial-Medium.otf, themes/uniserver/assets/fonts/GT-America-Trial-Light.otf, themes/uniserver/assets/fonts/GT-America-Trial-Bold.otf, themes/uniserver/assets/fonts, themes/uniserver/assets/css/main.css.map, themes/uniserver/assets/css/main.css, themes/uniserver/assets/css, themes/uniserver/assets, themes/uniserver/check.php, themes/uniserver/default.php, themes/uniserver/vacature.php, themes/uniserver/team.php, themes/uniserver/jobs.php, themes/uniserver/partners.php, themes/uniserver/vacancies.php, themes/uniserver/view.php, themes/uniserver/article.php, themes/uniserver/description.txt, themes/uniserver/about.php, themes/uniserver/job.php, themes/uniserver/full.php, themes/uniserver/trending.php, themes/uniserver/knowledge_base.php, themes/uniserver/home.php, themes/uniserver/contact.php, themes/uniserver/header.php, themes/uniserver/elements/image_header.php, themes/uniserver/elements/check/challenges.php, themes/uniserver/elements/check/specialties.php, themes/uniserver/elements/check/sectors.php, themes/uniserver/elements/check/success.php, themes/uniserver/elements/check/ambition.php, themes/uniserver/elements/check/advice.php, themes/uniserver/elements/check/size.php, themes/uniserver/elements/check/challenges-cloud.php, themes/uniserver/elements/check, themes/uniserver/elements/footer_bottom.php, themes/uniserver/elements/footer.php, themes/uniserver/elements/header_top.php, themes/uniserver/elements/header.php, themes/uniserver/elements/faq.php, themes/uniserver/elements, themes/uniserver/page_not_found.php, themes/uniserver/product.php, themes/uniserver, views/files.zip, src/Uniserver/Download.php, src/Uniserver/Check.php, src/Uniserver/Video.php, src/Uniserver

# concrete5 Cache Settings
Block Cache - Off
Overrides Cache - Off
Full Page Caching - Off
Full Page Cache Lifetime - Every 6 hours (default setting).

# Server Software
nginx/1.13.12

# Server API
fpm-fcgi

# PHP Version
5.5.38

# PHP Extensions
bcmath, calendar, cgi-fcgi, Core, ctype, curl, date, dom, ereg, fileinfo, filter, ftp, gd, gettext, hash, htscanner, iconv, intl, json, libxml, mbstring, mcrypt, mhash, mysql, mysqli, mysqlnd, openssl, pcre, PDO, pdo_mysql, pdo_sqlite, Phar, posix, Reflection, session, SimpleXML, soap, sockets, SPL, sqlite3, standard, tokenizer, xml, xmlreader, xmlwriter, xsl, Zend OPcache, zip, zlib

# PHP Settings
max_execution_time - 600
log_errors_max_len - 1024
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - 600
max_input_vars - 10000
memory_limit - 256M
post_max_size - 128M
sql.safe_mode - Off
upload_max_filesize - 128M
mysql.max_links - Unlimited
mysql.max_persistent - Unlimited
mysqli.max_links - Unlimited
mysqli.max_persistent - Unlimited
pcre.backtrack_limit - 1000000
pcre.recursion_limit - 100000
session.cache_limiter - <i>no value</i>
session.gc_maxlifetime - 7200
soap.wsdl_cache_limit - 5
opcache.max_accelerated_files - 2000
opcache.max_file_size - 0
opcache.max_wasted_percentage - 5

Browser User-Agent String

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36