Selection owner couldn’t convert: STRING

[Sharon Kimble]

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I've found a problem with Imenu and org-mode, and the error report says -

=====
Selection owner couldn’t convert: STRING
Error in menu-bar-update-hook (imenu-update-menubar): (wrong-type-argument 
char-or-string-p nil)        
=====

And its locking all of the menu-bar up such that nothing on it can be used!

I've rebuilt emacs twice, which also included deleting my git repo of it, and 
re-downloading emacs from git and rebuilding. But its made no difference!       
 

I've also re-downloading org-mode and rebuilt it, still with no solution!

My Imenu configuration hasn't changed since January 2021, so please, how can I 
get Imenu working properly again?

(I'm sending this to the org-mode mailing list because the problem only occurs 
in org-mode.)    

Thanks
    Sharon.    
- -- 
A taste of linux = http://www.sharons.org.uk
TGmeds = http://www.tgmeds.org.uk
DrugFacts = https://www.drugfacts.org.uk
Debian 11.4, fluxbox 1.3.7, emacs 29.0.50, org 9.5.4 
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