Undefined property message | WordPress.org

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Hi! In ‘Folder Settings’ the following warning appears at the top of the page:


Warning: Undefined property: WCP_Folder_Plugins::$is_exists in /.../wp-content/plugins/folders/includes/folders.class.php on line 5479

The referenced line reads:

$is_plugin_exists = $plugins->is_exists;

Pls, is there anything I need do.
Fantastic plugin!
thank you,
Jasmine