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Has this even been solved? I have exactly the same problem and tried the database fixes without any result. This is what I get in Joomla when I try to add a post
danger
Save failed with the following error: Field 'params' doesn't have a default value
Notice: Trying to get property 'parent_id' of non-object in /home/kleine/nieuw.kleine-rijopleidingen.nl/administrator/components/com_phocaguestbook/models/phocaguestbook.php on line 132
Address
So the new version of Phoca Guestbook gets the required column format?
In case the column format is still wrong, the only way is to correct it: viewtopic.php?p=176999#p176999 (but hard to say what it does not work for you )
No, I upgraded within Joomla itself. So I disabled Phoca Guestbook in Joomla 3, migrated the site and installed the new Phoca Guestbook zip file. All seemed to work well and I could manually add the comment of 2022-07-11.
I already tried the database solution from the other forum post but it makes no difference.
The new version is installed now but still the same problem.