Fatal Error on WordPress 6.3.1

Unfortunately, it automatically updated my wordpress system to 6.3.1. On the pages where I use the shortcode, the following message appears when I call it: There was a critical error on your site. I use RML (Real Media Library) as a plugin with the Medialist plugin as an add-on. Is this the case for anyone else? If I deactivate the plugin, the page load works again. Thank you I have run a few tests with version 6.3.1 with Medialist installed along side RML without issue. Are you Medialist to display the contents of folders within RML? Thank you for your quick reply. Exactly I use it to display the RML folders that contain pdfs in the frontend. Now on the staging environment where it works I also updated to wordpress 6.3.1 and it works. So it’s not the wordpress update after all. For your information: I have set up the website on a common web server (hoster is Mittwald), here everything works as well. I have then moved the entire site to an internal server, since the website should serve as an intranet. The server is an Ubuntu server with LAMP stack. So the URL has also changed to https://intra-net/ . Could be the error here? I have also already deleted the plugin and reinstalled, unfortunately without success. Does the plugin change anything in the htaccess file? I have attached the website status report: I have attached the website status report: ` wp-core version: 6.3.1 site_language: de_DE user_language: de_DE timezone: Europe/Berlin permalink: undefined https_status: true multisite: false user_registration: 0 blog_public: 0 default_comment_status: undefined environment_type: production user_count: 11 dotorg_communication: true wp-paths-sizes wordpress_path: /home/kh-intadmin/Klinet/klinet wordpress_size: 53,62 MB (56224288 bytes) uploads_path: /home/kh-intadmin/Klinet/klinet/wp-content/uploads uploads_size: 942,45 MB (988226382 bytes) themes_path: /home/kh-intadmin/Klinet/klinet/wp-content/themes themes_size: 14,68 kB (15028 bytes) plugins_path: /home/kh-intadmin/Klinet/klinet/wp-content/plugins plugins_size: 95,16 MB (99779673 bytes) database_size: 15,61 MB (16367616 bytes) total_size: 1,08 GB (1160612987 bytes) wp-active-theme name: Klinet Theme (oxygen-bare-minimum-theme) version: 1.0 author: Pixelhoch author_website: https://www.pixelhoch.de parent_theme: none theme_features: core-block-patterns, widgets-block-editor, woocommerce, wc-product-gallery-zoom, wc-product-gallery-lightbox, wc-product-gallery-slider, post-thumbnails, menus, title-tag theme_path: fake auto_update: Deaktiviert wp-plugins-active (20) Advanced Custom Fields PRO: version: 6.2.0, author: WP Engine (latest version: 6.2.1.1), Automatische Aktualisierungen deaktiviert Ajax Search Pro: version: 4.26.2, author: Ernest Marcinko, Automatische Aktualisierungen deaktiviert Better Search Replace: version: 1.4.3, author: WP Engine, Automatische Aktualisierungen deaktiviert Code Snippets: version: 3.4.2, author: Code Snippets Pro (latest version: 3.5.0), Automatische Aktualisierungen deaktiviert Custom Post Type UI: version: 1.14.0, author: WebDevStudios, Automatische Aktualisierungen deaktiviert Duplicate Page: version: 4.5.2, author: mndpsingh287 (latest version: 4.5.3), Automatische Aktualisierungen deaktiviert Justified Image Grid: version: 4.4.1, author: Firsh, Automatische Aktualisierungen deaktiviert Media List: version: 1.3.9, author: D. Relton, Automatische Aktualisierungen deaktiviert OxyExtras: version: 1.4.3, author: OxyExtras, Automatische Aktualisierungen deaktiviert Oxygen: version: 4.6.2, author: Soflyy (latest version: 4.7), Automatische Aktualisierungen deaktiviert Real Media Library: version: 4.21.11, author: devowl.io (latest version: 4.21.12), Automatische Aktualisierungen aktiviert Simple Local Avatars: version: 2.7.5, author: 10up, Automatische Aktualisierungen deaktiviert Staff/Employee Business Directory for Active Directory: version: 1.2.3, author: miniOrange, Automatische Aktualisierungen deaktiviert SVG Support: version: 2.5.5, author: Benbodhi, Automatische Aktualisierungen deaktiviert Ultimate Dashboard: version: 3.7.6, author: David Vongries (latest version: 3.7.7), Automatische Aktualisierungen deaktiviert Ultimate Dashboard PRO: version: 3.7.0.1, author: David Vongries, Automatische Aktualisierungen deaktiviert WP Mail SMTP: version: 3.9.0, author: WP Mail SMTP, Automatische Aktualisierungen deaktiviert WS Form PRO: version: 1.9.148, author: WS Form (latest version: 1.9.162), Automatische Aktualisierungen deaktiviert WS Form PRO - PDF: version: 1.2.1, author: WS Form, Automatische Aktualisierungen deaktiviert WS Form PRO - Post Management: version: 1.5.11, author: WS Form (latest version: 1.5.12), Automatische Aktualisierungen deaktiviert code-snippets (1) snippet-1: name: Schriftart, scope: global, modified: 2023-08-07 07:50:40, tags: [fonts] wp-media image_editor: WP_Image_Editor_Imagick imagick_module_version: 1691 imagemagick_version: ImageMagick 6.9.11-60 Q16 x86_64 2021-01-25 https://imagemagick.org imagick_version: 3.6.0 file_uploads: File uploads is turned off post_max_size: 128M upload_max_filesize: 80M max_effective_size: 80 MB max_file_uploads: 20 imagick_limits: imagick::RESOURCETYPE_AREA: 122 MB imagick::RESOURCETYPE_DISK: 1073741824 imagick::RESOURCETYPE_FILE: 6144 imagick::RESOURCETYPE_MAP: 512 MB imagick::RESOURCETYPE_MEMORY: 256 MB imagick::RESOURCETYPE_THREAD: 1 imagick::RESOURCETYPE_TIME: 9.2233720368548E+18 imagemagick_file_formats: 3FR, 3G2, 3GP, AAI, AI, APNG, ART, ARW, AVI, AVIF, AVS, BGR, BGRA, BGRO, BIE, BMP, BMP2, BMP3, BRF, CAL, CALS, CANVAS, CAPTION, CIN, CIP, CLIP, CMYK, CMYKA, CR2, CR3, CRW, CUR, CUT, DATA, DCM, DCR, DCX, DDS, DFONT, DNG, DPX, DXT1, DXT5, EPDF, EPI, EPS, EPS2, EPS3, EPSF, EPSI, EPT, EPT2, EPT3, ERF, FAX, FILE, FITS, FRACTAL, FTP, FTS, G3, G4, GIF, GIF87, GRADIENT, GRAY, GRAYA, GROUP4, H, HALD, HDR, HEIC, HISTOGRAM, HRZ, HTM, HTML, HTTP, HTTPS, ICB, ICO, ICON, IIQ, INFO, INLINE, IPL, ISOBRL, ISOBRL6, J2C, J2K, JBG, JBIG, JNG, JNX, JP2, JPC, JPE, JPEG, JPG, JPM, JPS, JPT, JSON, K25, KDC, LABEL, M2V, M4V, MAC, MAGICK, MAP, MASK, MAT, MATTE, MEF, MIFF, MKV, MNG, MONO, MOV, MP4, MPC, MPG, MRW, MSL, MTV, MVG, NEF, NRW, NULL, ORF, OTB, OTF, PAL, PALM, PAM, PATTERN, PBM, PCD, PCDS, PCL, PCT, PCX, PDB, PDF, PDFA, PEF, PES, PFA, PFB, PFM, PGM, PGX, PICON, PICT, PIX, PJPEG, PLASMA, PNG, PNG00, PNG24, PNG32, PNG48, PNG64, PNG8, PNM, POCKETMOD, PPM, PREVIEW, PS, PS2, PS3, PSB, PSD, PTIF, PWP, RADIAL-GRADIENT, RAF, RAS, RAW, RGB, RGBA, RGBO, RGF, RLA, RLE, RMF, RW2, SCR, SCT, SFW, SGI, SHTML, SIX, SIXEL, SPARSE-COLOR, SR2, SRF, STEGANO, SUN, TEXT, TGA, THUMBNAIL, TIFF, TIFF64, TILE, TIM, TTC, TTF, TXT, UBRL, UBRL6, UIL, UYVY, VDA, VICAR, VID, VIDEO, VIFF, VIPS, VST, WBMP, WEBM, WEBP, WMV, WPG, X, X3F, XBM, XC, XCF, XPM, XPS, XV, XWD, YCbCr, YCbCrA, YUV gd_version: 2.3.0 gd_formats: GIF, JPEG, PNG, WebP, BMP, XPM ghostscript_version: 9.55.0 wp-server server_architecture: Linux 5.15.0-84-generic x86_64 httpd_software: Apache/2.4.52 (Ubuntu) php_version: 8.1.2-1ubuntu2.14 64bit php_sapi: apache2handler max_input_variables: 1000 time_limit: 30 memory_limit: 256M max_input_time: 60 upload_max_filesize: 80M php_post_max_size: 128M curl_version: 7.81.0 OpenSSL/3.0.2 suhosin: false imagick_availability: true pretty_permalinks: true htaccess_extra_rules: false current: 2023-09-29T07:59:44+00:00 utc-time: Friday, 29-Sep-23 07:59:44 UTC server-time: 2023-09-29T09:59:42+02:00 wp-database extension: mysqli server_version: 8.0.34-0ubuntu0.22.04.1 client_version: mysqlnd 8.1.2-1ubuntu2.14 max_allowed_packet: 67108864 max_connections: 151 wp-constants WP_HOME: undefined WP_SITEURL: undefined WP_CONTENT_DIR: /home/kh-intadmin/Klinet/klinet/wp-content WP_PLUGIN_DIR: /home/kh-intadmin/Klinet/klinet/wp-content/plugins WP_MEMORY_LIMIT: 40M WP_MAX_MEMORY_LIMIT: 256M WP_DEBUG: false WP_DEBUG_DISPLAY: true WP_DEBUG_LOG: false SCRIPT_DEBUG: false WP_CACHE: false CONCATENATE_SCRIPTS: undefined COMPRESS_SCRIPTS: undefined COMPRESS_CSS: undefined WP_ENVIRONMENT_TYPE: Nicht definiert WP_DEVELOPMENT_MODE: undefined DB_CHARSET: utf8 DB_COLLATE: utf8_general_ci wp-filesystem wordpress: writable wp-content: writable uploads: writable plugins: writable themes: writable wp_mail_smtp version: 3.9.0 license_key_type: lite debug: E-Mail-Quelle WP-Kern Mailer: Anderer SMTP-Server PHPMailer was able to connect to SMTP server but failed while trying to send an email.; E-Mail-Quelle WP-Kern Mailer: Anderer SMTP-Server SMTP Error: The following recipients failed: p644179@wordpress.p644179.webspaceconfig.de: SMTP; Unable to relay recipient in non-accepted domain lite_install_date: Sep 20, 2023 @ 11:14am in the Error.log of the Apache server I find messages that are due to the Medialist plugin, can you see something here? [Fri Sep 29 06:06:07.527117 2023] [php:warn] [pid 14613] [client 191.5.105.98:54982] PHP Warning: get_headers(): Failed to enable crypto in /home/kh-intadmin/Klinet/klinet/wp-content/plugins/media-list/medialist.php on line 68, referer: https://intra-net/?page_id=174&ct_builder=true&ct_inner=true&oxygen_iframe=true [Fri Sep 29 06:06:07.527308 2023] [php:warn] [pid 14613] [client 191.5.105.98:54982] PHP Warning: get_headers( https://intra-net/wp-content/uploads/MAP_MI_A-Leitbild-der-Apotheke_100515.pdf ): Failed to open stream: operation failed in /home/kh-intadmin/Klinet/klinet/wp-content/plugins/media-list/medialist.php on line 68, referer: https://intra-net/?page_id=174&ct_builder=true&ct_inner=true&oxygen_iframe=true [Fri Sep 29 06:06:07.527405 2023] [php:error] [pid 14613] [client 191.5.105.98:54982] PHP Fatal error: Uncaught TypeError: array_change_key_case(): Argument #1 ($array) must be of type array, bool given in /home/kh-intadmin/Klinet/klinet/wp-content/plugins/media-list/medialist.php:68\nStack trace:\n#0 /home/kh-intadmin/Klinet/klinet/wp-content/plugins/media-list/medialist.php(68): array_change_key_case()\n#1 /home/kh-intadmin/Klinet/klinet/wp-content/plugins/media-list/medialist.php(421): medialistpluginclass->medialistgeturlfilesize()\n#2 /home/kh-intadmin/Klinet/klinet/wp-includes/shortcodes.php(395): medialistpluginclass->medialistmainplugin()\n#3 [internal function]: do_shortcode_tag()\n#4 /home/kh-intadmin/Klinet/klinet/wp-includes/shortcodes.php(235): preg_replace_callback()\n#5 /home/kh-intadmin/Klinet/klinet/wp-content/plugins/oxygen/component-framework/components/layouts/shortcode.php(99): do_shortcode()\n#6 /home/kh-intadmin/Klinet/klinet/wp-includes/template-loader.php(106): include(‘…’)\n#7 /home/kh-intadmin/Klinet/klinet/wp-blog-header.php(19): require_once(‘…’)\n#8 /home/kh-intadmin/Klinet/klinet/index.php(17): require(‘…’)\n#9 {main}\n thrown in /home/kh-intadmin/Klinet/klinet/wp-content/plugins/media-list/medialist.php on line 68, referer: https://intra-net/?page_id=174&ct_builder=true&ct_inner=true&oxygen_iframe=true Im not sure what could be causing it, seems to be an incompatibility with another plugin or some content. I’d look at oxygen and attached files to see if you duplicate it in a staging environment.