Fatal error: Uncaught TypeError

Wordpress 6.0
H5P Version 1.15.4

I've tried to change the title within a multiple choice question. It didn't work. I've tried different browsers (Opera, Firefox, Chrome). After "aktualisieren" it looked this way: 

Fatal error: Uncaught TypeError: implode(): Argument #2 ($array) must be of type ?array, string given in /homepages/0/.../htdocs/clickandbuilds/ECHTKRASS/wp-content/plugins/h5pmods-wordpress-plugin-master/h5pmods.php:231 Stack trace: #0 /homepages/0/.../htdocs/clickandbuilds/ECHTKRASS/wp-content/plugins/h5pmods-wordpress-plugin-master/h5pmods.php(231): implode(Array, '/') #1 /homepages/0/.../htdocs/clickandbuilds/ECHTKRASS/wp-content/plugins/h5pmods-wordpress-plugin-master/h5pmods.php(220): find_semantics_path('answers/answer/...', Object(stdClass)) #2 /homepages/0/.../htdocs/clickandbuilds/ECHTKRASS/wp-content/plugins/h5pmods-wordpress-plugin-master/h5pmods.php(52): find_semantics_path('answers/answer/...', Array) #3 /homepages/0/.../htdocs/clickandbuilds/ECHTKRASS/wp-includes/class-wp-hook.php(307): h5pmods_alter_semantics(Array, 'H5P.MultiChoice', '1', '14') #4 /homepages/0/.../htdocs/clickandbuilds/ECHTKRASS/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters('', Array) #5 /homepages/0/.../htdocs/clickandbuilds/ECHTKRASS/wp-includes/plugin.php(524): WP_Hook->do_action(Array) #6 /homepages/0/.../htdocs/clickandbuilds/ECHTKRASS/wp-content/plugins/h5p/public/class-h5p-wordpress.php(672): do_action_ref_array('h5p_alter_libra...', Array) #7 /homepages/0/.../htdocs/clickandbuilds/ECHTKRASS/wp-content/plugins/h5p/h5p-php-library/h5p.classes.php(2493): H5PWordPress->alterLibrarySemantics(Array, 'H5P.MultiChoice', '1', '14') #8 /homepages/0/.../htdocs/clickandbuilds/ECHTKRASS/wp-content/plugins/h5p/h5p-php-library/h5p.classes.php(4104): H5PCore->loadLibrarySemantics('H5P.MultiChoice', '1', '14') #9 /homepages/0/.../htdocs/clickandbuilds/ECHTKRASS/wp-content/plugins/h5p/h5p-php-library/h5p.classes.php(4009): H5PContentValidator->validateLibrary(Object(stdClass), Object(stdClass)) #10 /homepages/0/.../htdocs/clickandbuilds/ECHTKRASS/wp-content/plugins/h5p/h5p-php-library/h5p.classes.php(3852): H5PContentValidator->validateGroup(Object(stdClass), Object(stdClass)) #11 /homepages/0/.../htdocs/clickandbuilds/ECHTKRASS/wp-content/plugins/h5p/h5p-php-library/h5p.classes.php(4009): H5PContentValidator->validateList(Array, Object(stdClass)) #12 /homepages/0/.../htdocs/clickandbuilds/ECHTKRASS/wp-content/plugins/h5p/h5p-php-library/h5p.classes.php(4115): H5PContentValidator->validateGroup(Object(stdClass), Object(stdClass), false) #13 /homepages/0/.../htdocs/clickandbuilds/ECHTKRASS/wp-content/plugins/h5p/h5p-php-library/h5p.classes.php(2172): H5PContentValidator->validateLibrary(Object(stdClass), Object(stdClass)) #14 /homepages/0/.../htdocs/clickandbuilds/ECHTKRASS/wp-content/plugins/h5p/public/class-h5p-plugin.php(939): H5PCore->filterParameters(Array) #15 /homepages/0/.../htdocs/clickandbuilds/ECHTKRASS/wp-content/plugins/h5p/public/class-h5p-plugin.php(1033): H5P_Plugin->get_content_settings(Array) #16 /homepages/0/.../htdocs/clickandbuilds/ECHTKRASS/wp-content/plugins/h5p/admin/class-h5p-content-admin.php(250): H5P_Plugin->add_assets(Array) #17 /homepages/0/.../htdocs/clickandbuilds/ECHTKRASS/wp-includes/class-wp-hook.php(307): H5PContentAdmin->display_contents_page('') #18 /homepages/0/.../htdocs/clickandbuilds/ECHTKRASS/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters('', Array) #19 /homepages/0/.../htdocs/clickandbuilds/ECHTKRASS/wp-includes/plugin.php(476): WP_Hook->do_action(Array) #20 /homepages/0/.../htdocs/clickandbuilds/ECHTKRASS/wp-admin/admin.php(259): do_action('toplevel_page_h...') #21 {main} thrown in /homepages/0/.../htdocs/clickandbuilds/ECHTKRASS/wp-content/plugins/h5pmods-wordpress-plugin-master/h5pmods.php on line 231

Es gab einen kritischen Fehler auf deiner Website. Bitte überprüfe den Posteingang deiner Website-Administrator-E-Mail-Adresse für weitere Anweisungen.

Any idea what to do now? Antwort gerne auch auf Deutsch :-)

Danke!