Error when deleting songbook

Hi!
when I want to delete a songbook I get the following error-message:

Traceback (most recent call last):

File "/usr/lib/python3.7/site-packages/openlp/plugins/songs/forms/songmaintenanceform.py", line 492, in on_delete_book_button_clicked

'This book cannot be deleted, it is currently assigned to at least one song.'))

File "/usr/lib/python3.7/site-packages/openlp/plugins/songs/forms/songmaintenanceform.py", line 109, in _delete_item

if item and not item.songs:

AttributeError: 'Book' object has no attribute 'songs'

Some more information:
  • My OS: fedora 31
  • Version of OpenLP: 2.4.6
Maybe this is important, too: Even if I create a new book and want to delete it right after, I get the same error. So its defenitly wrong, that the book is assigned to at least one song.
Has someone of you any idea? Thank you very much in advance!

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