Hi,
I've just installed a brand new Joomla 4.3.3 on my local test server with the latest version of HikaShop and I don't get that error when I edit a product in the backend.
Also, based on the error message details, it seems to indicate that there is a problem with the loading of the Joomla HTML editor parameters by the Joomla library.
So we'll need more information to better understand the issue. It might actually be something which needs to be fixed in Joomla. Especially, since the code pointed at by the error message has been recently changed by the Joomla developers.
Do you have the issue if you try to edit a Joomla article ?
Do you have the issue if you try with another browser ?
Do you have the issue after saving the settings of the editor plugins in the Joomla plugins manager ?
Do you have the issue after trying to fix the database structure of Joomla (
docs.joomla.org/Help310:Extensions_Extension_Manager_Database
) ? I'm thinking that if the table where the parameters of the plugins was corrupted in some way, it might lead to Joomla being unable to load the plugin parameters, and then this error message.