Warning: Invalid argument

Noticed of late that every time I update ANY plugin, below warning appears on page that shows plugin update progress:

Warning: Invalid argument supplied for foreach() in /www/wwwroot/mydomain.com/wp-content/plugins/advanced-iframe/advanced-iframe.php on line 66

Not sure why?

if ($options['action'] === 'update' && $options['type'] === 'plugin' ) {
 foreach($options['plugins'] as $each_plugin) { //line 66
 if ($each_plugin==$current_plugin_path_name) {
 $this->saveExternalJsFile(false);
 }
}