PHP_errors

-- HikaShop version -- : 3.4.0
-- Joomla version -- : 3.8.7
-- PHP version -- : 5.6.30
-- Browser(s) name and version -- : All
-- Error-message(debug-mod must be tuned on) -- : Strict Standards: Only variables should be assigned by reference in /xxxx/x/xxxxx/xxxxxxxxx/public_html/plugins/user/hikashop/hikashop.php on line 21

PHP_errors.log:
[19-Apr-2018 09:16:12 Europe/Moscow] PHP Notice: Undefined offset: 0 in /xxxx/x/xxxxx/xxxxxxxxx/public_html/plugins/system/hikashopgeolocation/hikashopgeolocation.php on line 241
[19-Apr-2018 09:16:12 Europe/Moscow] PHP Notice: Trying to get property of non-object in /xxxx/x/xxxxx/xxxxxxxxx/public_html/plugins/system/hikashopgeolocation/hikashopgeolocation.php on line 241

on the authorization page:
Strict Standards: Only variables should be assigned by reference in /xxxx/x/xxxxx/xxxxxxxxx/public_html/plugins/user/hikashop/hikashop.php on line 21

Authorization error when switching to PHP-7.0 (HTTP ERROR 500)
High load on the site server,
Can you help?

Hello,

If you're only having "notice" and no warning messages it won't affect your shop.
Note that when your shop is in production mode you should :
- Disable the Joomla debug mode ("Administration->Global configuration->System->Debug System/Language")
- Set the "error reporting" option of the Joomla configuration to "none"

Also, Hikashop should support PHP 7