Uploaded the new file and works with the default options loaded. No debug log file is generated.

But if you change the default Filter option (List All) and select (Hide Filtered), you should see it will refresh the data but then create a similar debug error on line 285.

"[16-Jul-2017 18:43:19 America/Detroit] PHP Warning: array_key_exists() expects parameter 2 to be array, null given in user_tracking.php on line 285

The problem seems to be isolated to the above scenario.
No errors are reported if you choose (Show Filtered), or change the (Min Clicks) option, or (Show/Hide Spiders) options. No errors are also reported if you choose different dates as well. :)