[BUG] org-agenda column view error: wrong type markerp, nil [9.6.9 ( @ /path/to/org-9.6.9/)]

[John Borwick]

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.

--- #<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))

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