opencart 2.1.0.2 error Call to a member function get() on ar

Fatal error: Call to a member function get() on array in /home/kozhidn5/public_html/cribskart.com/index.php on line 97

i got this error
my opencart version is 2.1.0.2

plesae mention which is less buggy or good for beginner
my hosting provider is hostgator

Probably the latest version, 2.3.0.2 is best if you use it now instead?