Calendar sharing error

[gravitybacklight]

when sharing a calendar, some users are getting an error like:

Sharing 14 failed because this item is already shared with SHARENAME

The calendar isn't shared, but i think i have worked out the issue.

If the users calendar id in calendar_calendars matches the id of a share table entry, which has nothing to do with who it is shared with, it throws up the error.

Any user whos calendar id is not matching an id in share can successfully add the sharing that is required.

Using OC 4.5.1

[DeepDiver1975]

@apt-net Thanks a lot for this bug report.
May I ask you to reopen this issue on the apps repo?
https://github.com/owncloud/apps/issues/new

THX

[gravitybacklight]

done

[DeepDiver1975]

THX