undefined variable warning

  • Notice: Undefined variable: parent in /home14/itakecom/public_html/reec.com.au/wp-content/plugins/collapsing-categories/collapscatlist.php on line 614

    I got this notice and want to know how to solve it.
    I am using php5.6, wordpress4.4.2, woocommerce3.8.0

    The page I need help with: [log in to see the link]

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