Error after implementing behavior

[rastitkac]

Hi there, awesome plugin. Unfortunately, I wasn't able to get it to work. I tried to activate the RainLab.Blog Integration but it wouldn't replace the content editor with Gutenberg. Then I followed the usage instructions but I get an error on the edit page. it reads "Trying to get property 'contentable_id' of non-object" on line 101 of <truncated>/vendor/october/rain/src/Database/Relations/MorphOne.php Any ideas why?