This happens when ejecting drive from Krusader itself. Also 'Sorry - The device is currently busy...' window popups .And it's popups +1 times. This means that first time this window pops up one time - then if drive wasn't removed and Krusader wasn't closed - upon second eject attempt - the windows pops up 2 times, upon next attempt 3 times and so on.
Created attachment 107350 [details] the-device-is-currently-busy
How do you eject a drive from Krusader itself?
Firstly mount the drive and open it in Krusader - than by left clicking on Media Button - and then right click on mounted drive and choosing 'Unmount' or by left clicking on Navigator bar and choosing 'Safely Remove' menu option
Created attachment 110832 [details] media-button-unmount
Created attachment 110833 [details] navigator-bar-safely-remove
Thanks for the explanation! I confirm this issue. Dolphin handles this case pretty well (if you press Eject in the Device Notifier, I'm haven't checked if they have an action within Dolphin). AFAIR, Total Commander also able to eject even if the folder on the device is open, however it changes the dir to default drive. BTW, +1 error message appear only if you select "Unmount". For "Safely Remove" it is fine.
A possibly relevant merge request was started @ https://invent.kde.org/utilities/krusader/-/merge_requests/27
*** Bug 417703 has been marked as a duplicate of this bug. ***
Git commit 7b1fd7f6cdb3b39ff85eadf260824c49f396721e by Nikita Melnichenko, on behalf of Davide Gianforte. Committed on 16/05/2022 at 05:54. Pushed by melnichenko into branch 'master'. Unmount devices from external action Unmount a device when requested from an external program. Related: bug 417703 FIXED: [ 383668 ] Krusader blocks ejecting of removable drive by self 'krusader' process if drive is opened in it's tab FIXED: [ 417703 ] Cannot unmount an external device when it's opened by Krusader M +1 -0 krusader/GUI/mediabutton.cpp M +34 -0 krusader/MountMan/kmountman.cpp M +2 -0 krusader/MountMan/kmountman.h https://invent.kde.org/utilities/krusader/commit/7b1fd7f6cdb3b39ff85eadf260824c49f396721e