[Plugin: Get the Image] Notice thrown by image_by_scan()

I’m helping someone use this plugin with my Taxonomy Images plugin. Here’s the code that I am using (outside the loop in single.php)

if ( function_exists( 'get_the_image' ) ) {
	$src = get_the_image( array(
		'return_url'    => 'true',
		'echo'          => 'false',
		'link_to_post'  => 'false',
		'default_image' => '/a/screen/default_image.jpg',
		'image_scan'    => 'true',
		'meta_key'      => 'feature_img',
		'width'         => '45',
		'height'        => '55',
		'echo'          => false
	) );
}

This triggers php to throw the following notice:

Notice: Undefined offset: 0 in /Sites/plugins/get-the-image/get-the-image.php on line 313

Line 313 has the following code:

if ( isset( $matches ) && $matches[1][0] )
    return array( 'url' => $matches[1][0] );

The following modification removes the notice:

if ( isset( $matches[1][0] ) )
    return array( 'url' => $matches[1][0] );

http://wordpress.org/extend/plugins/get-the-image/