A PHP Error was encountered

Severity: Notice

Message: Trying to access array offset on value of type null

Filename: thongke/thongke-lo-roi.php

Line Number: 5

Backtrace:

File: /www/wwwroot/kqxs.live/libkqxs123/application/views/veso/thongke/thongke-lo-roi.php
Line: 5
Function: _error_handler

File: /www/wwwroot/kqxs.live/libkqxs123/application/libraries/Template.php
Line: 315
Function: view

File: /www/wwwroot/kqxs.live/libkqxs123/application/controllers/frontend/Xosothongke.php
Line: 1401
Function: write_view

File: /www/wwwroot/kqxs.live/index.php
Line: 316
Function: require_once