CMSMS 2.2.8
CGSmartImage 1.22.4 
php7.0

| PHP Notice:  Undefined variable: fh in
[...]/modules/CGSmartImage/CGSmartImage.module.php on line 277

Looks like a $fh != $fn typo...

| 277: if( is_file($fh) && filemtime($fn) < $thedate ) {

...in:

// ================

if( $dh = opendir($dir) ) {
    while( ($file = readdir($dh)) !== false ) {
        if( startswith($file,'.') ) continue; // ignore hidden files.
        $fn = cms_join_path($dir,$file);
        if( is_file($fh) && filemtime($fn) < $thedate ) {
            @unlink($fn);
           $n_removed++;
       }
    }
    closedir($dh);
}

// ================

I think this goes back a good few versions.