Hey. Also had this issue when upgrading some sites to PHP7. Making the following change fixes the issue. Please update the plugin with the change (if you agree it does the job).
In line 45 of the “geolocation-detector-for-gravity-forms.php” file:
Change:
$max_chars = self::get_counter_script($form_id, $field_id, $field[“maxLength”]);
To:
$max_chars = $this->get_counter_script($form_id, $field_id, $field[“maxLength”]);