php log error in library php

Latest Reply from Dave at 2014-11-21 05:52:20
Found the following php log errors (set WPdebug = true to view):

Notice: Undefined offset: -1 in /public_html/wp-content/themes/vaccination/inc/library.php on line 389

How can I solve this?

Tnx and regards,
Hi, there!
Where do you get this notice?

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