Errors when viewing profile

Device: Desktop
Browser: Chrome
OS: Windows 10

Steps to reproduce: Errors when trying to view profile. Can't see my active trades.

Anything else to add:
[phpBB Debug] PHP Warning: in file [ROOT]/memberlist.php on line 811: mysqli_fetch_array() expects parameter 1 to be mysqli_result, string given
[phpBB Debug] PHP Warning: in file [ROOT]/memberlist.php on line 815: mysqli_num_rows() expects parameter 1 to be mysqli_result, string given
[phpBB Debug] PHP Warning: in file [ROOT]/memberlist.php on line 874: mysqli_fetch_array() expects parameter 1 to be mysqli_result, string given
[phpBB Debug] PHP Warning: in file [ROOT]/memberlist.php on line 877: mysqli_num_rows() expects parameter 1 to be mysqli_result, string given
[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)