[Eskaliert zur 2. Ebene] Fatal error when saving translatable acf options page

I have an acf options page which used to work just fine but now whenever I save it I get a fatal error which seems to be related to acf / wpml:

Fatal error: Uncaught TypeError: md5(): Argument #1 ($string) must be of type string, array given in /home/alfredmu/public_html/dev/wp-content/plugins/acfml/classes/Strings/Package.php:174 Stack trace: #0 /home/alfredmu/public_html/dev/wp-content/plugins/acfml/classes/Strings/Package.php(174): md5(Array) #1 /home/alfredmu/public_html/dev/wp-content/plugins/acfml/classes/Options/EditorHooks.php(312): ACFMLStringsPackage::getStringName(Array, Array) #2 /home/alfredmu/public_html/dev/wp-content/plugins/acfml/classes/Options/EditorHooks.php(295): ACFMLOptionsEditorHooks->registerFieldTranslation(Array, Array, 'fr') #3 /home/alfredmu/public_html/dev/wp-content/plugins/acfml/classes/Options/EditorHooks.php(164): ACFMLOptionsEditorHooks->onUpdateTranslationValue(Array, 'options_fr', Array) #4 /home/alfredmu/public_html/dev/wp-includes/class-wp-hook.php(343): ACFMLOptionsEditorHooks->onUpdateValue(Array, 'options_fr', Array) #5 /home/alfredmu/public_html/dev/wp-includes/plugin.php(205): WP_Hook->apply_filters(Array, Array) #6 /home/alfredmu/public_html/dev/wp-content/plugins/advanced-custom-fields-pro/includes/acf-value-functions.php(244): apply_filters('acf/update_valu...', Array, 'options_fr', Array, Array) #7 /home/alfredmu/public_html/dev/wp-content/plugins/advanced-custom-fields-pro/includes/acf-value-functions.php(287): acf_update_value(Array, 'options_fr', Array) #8 /home/alfredmu/public_html/dev/wp-content/plugins/advanced-custom-fields-pro/includes/acf-form-functions.php(174): acf_update_values(Array, 'options_fr') #9 /home/alfredmu/public_html/dev/wp-includes/class-wp-hook.php(341): _acf_do_save_post('options_fr') #10 /home/alfredmu/public_html/dev/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters(NULL, Array) #11 /home/alfredmu/public_html/dev/wp-includes/plugin.php(522): WP_Hook->do_action(Array) #12 /home/alfredmu/public_html/dev/wp-content/plugins/advanced-custom-fields-pro/includes/acf-form-functions.php(152): do_action('acf/save_post', 'options_fr') #13 /home/alfredmu/public_html/dev/wp-content/plugins/advanced-custom-fields-pro/pro/admin/admin-options-page.php(100): acf_save_post('options_fr') #14 /home/alfredmu/public_html/dev/wp-includes/class-wp-hook.php(341): acf_admin_options_page->admin_load('') #15 /home/alfredmu/public_html/dev/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters('', Array) #16 /home/alfredmu/public_html/dev/wp-includes/plugin.php(522): WP_Hook->do_action(Array) #17 /home/alfredmu/public_html/dev/wp-admin/admin.php(242): do_action('load-kuia_page_...') #18 {main} thrown in /home/alfredmu/public_html/dev/wp-content/plugins/acfml/classes/Strings/Package.php on line 174
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