Error messages when I turn on debugging

When I turn on debugging I get the following error messages

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Notice: Undefined index: show_title in /home/giving/html/wp-content/plugins/fundraising/lib/template-functions.php on line 56

Notice: Undefined index: small_button in /home/giving/html/wp-content/plugins/fundraising/lib/template-functions.php on line 637

Notice: Undefined index: show_cc in /home/giving/html/wp-content/plugins/fundraising/lib/template-functions.php on line 641