PHP Notice Log – Undefined offset

Thank you for this great cache system. Recently I am getting huge amount of same PHP notice like following:

“PHP Notice: Undefined offset: -1 in /home/avsaimin/public_html/wp-content/plugins/wp-
fastest-cache/inc/js-utilities.php on line 67”

Is it known error or special for me? Any fix recomendation will be appreciated.

Best regards!

 

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