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In a theme there is a function for cache and I am getting warnings.

        $options = array('compress' => true);

        $parser = new Less_Parser($options);

        $update_cache = !file_exists($cache_file);

        $vars = ra_get_less_variables();

        if (!$update_cache) {

            $cacheData = unserialize(file_get_contents($cache_file));

            foreach ($cacheData['files'] as $file => $fileData) {

                if ($fileData['filemtime'] < filemtime($file)) {

                    $update_cache = true;

                    break;

                }

            }

        }

The line with the warning (PHP Warning:  filemtime(): stat failed) is:

                if ($fileData['filemtime'] < filemtime($file)) {

How can I fix this?

Thank you.

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