PHP notice for $i18n

[mahotilo]

With gpdebug is enabled and PhP 7.4, I have such a notice for line

CustomSections/_types/multi_lang_demo/section.php

Line 18 in 4abf010

$section_lang = self::$i18n['section']['lang'];

Notice (8)
Trying to access array offset on value of type bool
    in: /users/mhdev/www/addons/CustomSections-master/_types/multi_lang_demo/section.php
    on line: 18
    time: 2020-09-26 20:13:46 (1601151226)
    REQUEST_URI: /Admin/Addons/Q3VzdG9tU2VjdGlvbnMtbWFzdGVy
    REQUEST_METHOD: GET
    REMOTE_ADDR: 85.90.218.44
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