[top-contributors plugin] Small bug in version 1.4

I updated the plugin today on 4 of my websites and I get the same problem on all of them.

This error message is showing in the recent comments widget and in the comments area in the backend. When I uncheck “Top Contributor Icon” the errors are gone again.

The error:
Warning: in_array() [function.in-array]: Wrong datatype for second argument in /home/piccaz/domains/piccaz.com/public_html/wp-content/plugins/top-contributors/functions.inc.php on line 555

Had to disable the plugin on my live sites for now, so here’s a dev site where you can see the error in the right sidebar.
http://95.211.2.18/~destiftv2/

Thanks for this great plugin though, I’ve been using it for a long time and I’m sure this will be fixed somehow.