Extension works, but throws an error (at least visually), which is annoying.

Aug 01 09:28:17 spurlos-ThinkPad-E580 gnome-shell[3261]: #1 555c1c82ed08 i /home/spurlos/.local/share/gnome-shell/extensions/remove-dropdown-arrows@mpdeimos.com/extension.js:154 (1ff7289dc178 @ 66)
Aug 01 09:28:17 spurlos-ThinkPad-E580 gnome-shell[3261]: JS ERROR: Extension remove-dropdown-arrows@mpdeimos.com: Error: Argument 'instance' (type interface) may not be null
disable@/home/spurlos/.local/share/gnome-shell/extensions/remove-dropdown-arrows@mpdeimos.com/extension.js:154:27