laravel-medialibrary: Return value of Spatie\MediaLibrary\PathGenerator\BasePathGenerator::getBasePath() must be of the type string, null returned

I had this error and it occurred because I didn’t save the model first $model->save() before creating media to attach and calling $media->getUrl()

So check to make sure you save the model first and it exists in the database if you are calling that method.

This issue was again introduced in version 9.8.3

@vlados if you already know a solution, feel free to PR the fix + tests to make sure the bug isn’t introduced again.