Fixed PHP Errors on top of page

Device:
Browser: Chrome on MacOS (both lastest)
OS:

Steps to reproduce: View Profile

Anything else to add:

[phpBB Debug] PHP Warning: in file [ROOT]/memberlist.php on line 878: Invalid argument supplied for foreach()
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 4166: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3009)
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 4166: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3009)
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 4166: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3009)
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 4166: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3009)