PHP Notice:  Undefined offset: 0 in /home/....../public_html/oc-content/themes/zara_child/search.php on line 23

how i can solve this? is this any error?

@Ghany
Go to file:
oc-content/themes/zara/search.php   (or equivalent in child)

Find 23 line:
$search_cat_id = $search_cat_id[0];
Replace with:
$search_cat_id = isset($search_cat_id[0]) ? $search_cat_id[0] : '';

after changing above modifications i got this errors

[19-Mar-2016 01:14:32 Asia/Kolkata] PHP Notice:  Undefined index: pk_i_id in /home/cla..../public_html/oc-includes/osclass/helpers/hDefines.php on line 493
[19-Mar-2016 01:14:32 Asia/Kolkata] PHP Notice:  Undefined index: s_city in /home/cla..../public_html/oc-includes/osclass/helpers/hDefines.php on line 494
[19-Mar-2016 01:14:32 Asia/Kolkata] PHP Notice:  Undefined index: s_title in /home/cla..../public_html/oc-includes/osclass/helpers/hDefines.php on line 495

@Ghany
Those are not related to theme as you can see from description.

i dont know if it is related to theme or osclass, but i got that errors after changing above modificatons, ok thank u bro, can u tell me this errors are major errors or small errors?

@Ghany
That is not error, but notice.

ok ok bro