Alert notifications: Module Class premium index missing

[deweblooper]

Many notifications invoked on multiple BO pages (Modules, Performance,...) about:
...
Notice on line 1008 in file classes/module/Module.php
[8] Undefined index: premium
Notice on line 968 in file classes/module/Module.php
[8] Undefined index: premium
...

Store information
Thirty bees version: 1.6.0
Thirty bees revision: da60bc8
Build for PHP version: 7.4
Shop URL: localhost
Current theme in use: Niara

Server information
Server information: Windows NT build 18362 (Windows 10) AMD64
Server software version: Apache/2.4.59 (Win64) OpenSSL/3.1.5 PHP/7.4.33
PHP version: 7.4.33
Memory limit: 1024M
Max execution time: 480

Database information
MySQL version: 10.8.3-MariaDB
MySQL server: localhost
MySQL name: ***
MySQL user: ***
Tables prefix: ***
MySQL engine: InnoDB
MySQL driver: PDO

Your information
Your web browser: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/119.0

Check your configuration
Required parameters: OK
Optional parameters: OK