Some warnings when saving the settings

[mircobabini]

Warning: Undefined array key "container-on" in wp-content/plugins/duracelltomi-google-tag-manager/admin/admin.php on line 655
Warning: Undefined array key "compat-mode" in wp-content/plugins/duracelltomi-google-tag-manager/admin/admin.php on line 656

[aksld]

Hello, I can confirm that these warnings are present in the logs.

AH01071: Got error 'PHP message: PHP Warning: Undefined array key "container-on" in /public/content/plugins/duracelltomi-google-tag-manager/admin/admin.php on line 655; PHP message: PHP Warning: Undefined array key "compat-mode" in /public/content/plugins/duracelltomi-google-tag-manager/admin/admin.php on line 656', referer: https://site.com/wp/wp-admin/options-general.php?page=gtm4wp-settings