"Load more" button not working on some pages

[gwuen]

The "Load more" button is non-functional on the pages "Artists", "Subscriptions" and "Albums", with the loading icon spinning indefinitely. The error is the same for all three of them:

(com.vixalien.muzika.Devel:2): Gjs-CRITICAL **: 04:00:30.473: JS ERROR: TypeError: this.constructor.loader is not a function
load_more@resource:///com/vixalien/muzika/js/main.js:16732:22
AbstractLibraryPage/<@resource:///com/vixalien/muzika/js/main.js:16670:12
paginated_cb@resource:///com/vixalien/muzika/js/main.js:16608:10
on_button_clicked@resource:///com/vixalien/muzika/js/main.js:16853:10
main@resource:///com/vixalien/muzika/js/main.js:31284:14
run@resource:///org/gnome/gjs/modules/script/package.js:207:19
@file:///app/bin/com.vixalien.muzika.Devel:22:40
@file:///app/bin/com.vixalien.muzika.Devel:28:6

This does not occur on the pages "Library" and "Songs" (and also not on the "History" page, since there's no button to load more).