Fatal Error with Plugin Version 5.9.7

Hi,

There's something wrong with version 5.9.7. I installed and then tried to activate it but it threw an ugly dump - please see below. The plugin keeps "activating" all the time

When I open a new tab and naviate to the Plugins page, I can see the version 5.9.7 is activated. But I cannot explain what causes this fatal error code dump.

Kind regards,

Activation failed: < !DOCTYPE html>Welcome to Meta Box &lsaquo;
sub.domain.tld &#8212;

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' ' : ' no-' ) + cs; }()); Skip to main content Skip to toolbar Dashboard DashboardHomeUpdates 0 Posts PostsAll PostsAdd New PostCategoriesTags Media MediaLibraryAdd New Media File Pages PagesAll PagesAdd New Page Comments 00 Comments in moderation Appearance AppearanceThemes 0Editor Plugins 0 Plugins 0Installed PluginsAdd New Plugin Users UsersAll UsersAdd New UserProfile Tools ToolsAvailable ToolsImportExportSite Health 0Export Personal DataErase Personal Data Settings SettingsGeneralWritingReadingDiscussionMediaPermalinksPrivacyFluentSMTPEdit Author SlugLiteSpeed Cache AAM WPvivid Plugin WPvivid PluginDashboardManual BackupExport SiteImport SiteBackup ScheduleBackup ManagerCloud StorageDatabase SnapshotsUnused Image CleanerRollbackExport/Import PageSettingsDebugLicense WPCodeBox 2 FluentAuth FluentAuthDashboardSecurity SettingsSocial LoginLogin RedirectsLogs LiteSpeed Cache LiteSpeed CacheDashboardPresetsGeneralCacheCDNImage OptimizationPage OptimizationDatabaseCrawlerToolboxCollapse menu Menusub.domain.tldVisit SiteNewPostMediaPageManageSettingsImage OptimizationPurge AllPurge All - LSCachePurge All - CSS/JS CachePurge All - Object CachePurge All - Opcode CacheHowdy, Template AdminTemplate Adminui8otyr3grdmpapd6y7gwop0klEdit ProfileLog Out Purged all caches successfully. Welcome to Meta Box Meta Box is a free Gutenberg and GDPR-compatible WordPress custom fields plugin and framework that makes quick work of customizing a website with—you guessed it—meta boxes and custom fields in WordPress. Follow the instruction below to get started! Meta Box Documentation Support Facebook Group Youtube Channel Getting Started Extensions Support Getting Started With Online Generator Online Generator is a free tool to help you create and set up custom fields using a simple, friendly user interface. With it, you can add fields, set options and generate needed code that's ready to copy and paste. Go to Online Generator Extensions Wanna see more features that transform your WordPress website into a powerful CMS? Check out some extensions below: Meta Box Builder - Build meta boxes and fields with UI. Meta Box Group - Organize fields into repeatable groups. Meta Box Conditional Logic - Control the visibility of fields. MB Settings Page - Create settings pages/Customizer options. More Extensions Extend custom fields in WordPress well beyond what others would ever consider ordinary! Save over 80% with our extensions bundles. View Bundles &rarr; MB Custom Post Type Create and manage custom post types easily in WordPress with an easy-to-use interface. Free Download Meta Box Builder Drag and drop your custom fields into place without a single line of code. Learn More Meta Box Group Create repeatable groups of custom fields for better appearance and structure. Learn More MB Settings Page Create a powerful settings page for your theme, plugin or website. Learn More Meta Box Conditional Logic Control the visibility of meta boxes and fields or even HTML elements with ease. Learn More MB User Profile Create register, login and edit user profile forms in the frontend. Embed everywhere with shortcodes. Learn More MB Frontend Submission Create frontend forms for users to submit custom content. Embed everywhere with shortcode. Learn More MB Custom Table Save custom fields data to custom table. Reduce database size and increase performance. Learn More MB Relationships Create many-to-many relationships between posts, terms and users. Free Download View all extensions &rarr; Still need help with Meta Box? We offer excellent support for you. But don't forget to check our documentation first. Free Support If you have any question about how to use the plugin, please open a new topic on WordPress.org support forum or open a new issue on Github (preferable). We will try to answer as soon as we can. Go to Github &rarr; Go to WordPress.org &rarr; Premium Support For users that have bought premium extensions, the support is provided in the Meta Box Support forum. Any question will be answered with technical details within 24 hours. Go to support forum &rarr; Our WordPress Products Like this plugin? 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