Error in org-caldav-generate-ics after org update

[Korydween]

I recently updated my org package after a while, and encountered the following error when trying to sync by org files with my nextcloud server: "Invalid version syntax: ‘’ (must start with a number)

The backtrace gave me the following information:

Debugger entered--Lisp error: (error "Invalid version syntax: ‘’ (must start with a number)")
  signal(error ("Invalid version syntax: ‘’ (must start with a number)"))
  error("Invalid version syntax: `%s' (must start with a number)" "")
  version-to-list("")
  version<("" "8.3beta")
  org-caldav-generate-ics()
  #f(compiled-function () #<bytecode 0x188e1fd>)()
  funcall(#f(compiled-function () #<bytecode 0x188e1fd>))
  (let ((org-caldav-inbox (quote "~/private/nextcloud/org/org-caldav/org-work-inbox.org")) (org-caldav-files (quote ("~/private/nextcloud/org/work/work.org"))) (org-caldav-calendar-id (quote "org-work"))) (funcall (quote #f(compiled-function () #<bytecode 0x188e1fd>))))
  eval((let ((org-caldav-inbox (quote "~/private/nextcloud/org/org-caldav/org-work-inbox.org")) (org-caldav-files (quote ("~/private/nextcloud/org/work/work.org"))) (org-caldav-calendar-id (quote "org-work"))) (funcall (quote #f(compiled-function () #<bytecode 0x188e1fd>)))))
  org-caldav-sync-calendar((:calendar-id "org-work" :files ("~/private/nextcloud/org/work/work.org") :inbox "~/private/nextcloud/org/org-caldav/org-work-inbox.org"))
  org-caldav-sync()
  funcall-interactively(org-caldav-sync)
  call-interactively(org-caldav-sync nil nil)
  command-execute(org-caldav-sync)

I traced it dow to line 1319 in org-caldav.el. When replacing (if (version< org-version "8.3beta") by (if nil) and re-evaluating the expression, the sync worked again.

I am using org 9.4.4 and org-caldav 20200510.2030.

[JesusTorrado]

Seems to be known and solved in the next org release: https://orgmode.org/list/[email protected]/