Hi Paul,
Thanks for posting this. Could you please explain in a few lines what you did to solve the issue? I read the other post too but didn't quite understand what the fix is, I also checked the config.php file for any related settings with no luck. I do have the same issue and the only workaround I found is to change the field in the database to accept NULL values which is not very efficient really.
Would be grateful if you can spare two lines giving some useful insight into this.
Thank you in advance!