Error message, when i try to view certain image files

Recently i found some images in certain folders, some PNG or JPG files, which throw the error message "an error occured 'create collection of Marked Picture\folder icons': the file already exists. (80)".

This seems related to the other topic i have reported "Strange effect, "collection - marked pictures". Either it's some kind of bug, or i might have messed up something in the settings, which i doubt, because i don't recall having changed anything to do with collections. This happens in certain folders on my SSD, the one which is NTFS formatted. So that's pretty strange, since other image files on my other drives do not show that error message.

edit: i have just checked the collection "Marked Pictures", but it doesn't contain any folder by the name of "folder icons".