kama on "[Plugin: Image Credits] Error - Warning shows up when using short-code"

When I call the short-code [image-credits], it shows this warning at the top of my page.

Warning: in_array() [function.in-array]: Wrong datatype for second argument in /home/trev72w7/public_html/BUMPKY.COM/wp-content/plugins/image-credits/plugin.php on line 137

How could I fix this?

http://wordpress.org/extend/plugins/image-credits/