148 $image[$cache_key] = $image;
throws a warning in the WordPress backend in the Favourite Image column:
"Warning: Illegal string offset 'featured_column_thumbnail' in /www/htdocs/root/wp-content/plugins/featured-image-column/featured-image-column.php on line 148"
The warning disappears if the above mentioned line is commented out or deleted.
What is the purpose of this line?