Hello! After updating org-mode, when I do the below:

  1. Run a custom org-agenda =C-c a w= that has a column view format. (This 
works correctly)
  2. Open a different buffer
  3. Re-run org-agenda

I get the error =Wrong type argument: markerp, nil=.

Using the debugger, I found the error occurred in =org-colview.el=. I no longer 
have the error when using the below workaround.

#+begin_src patch
--- #<buffer org-colview-orig.el>
+++ #<buffer org-colview.el>
@@ -525,6 +525,8 @@
       (setq header-line-format org-previous-header-line-format)
       (kill-local-variable 'org-previous-header-line-format)
       (remove-hook 'post-command-hook #'org-columns-hscroll-title 'local))
+    (setq org-columns-begin-marker (make-marker))
     (set-marker org-columns-begin-marker nil)
     (when (markerp org-columns-top-level-marker)
       (set-marker org-columns-top-level-marker nil))
#+end_src

Emacs  : GNU Emacs 28.2 (build 1, x86_64-apple-darwin18.7.0, NS appkit-1671.60 
Version 10.14.6 (Build 18G95))
 of 2023-02-22
Package: Org mode version 9.6.9 ( @ /path/to/org-9.6.9/)
-- 
John Borwick

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